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Home > Knowledge Base > Diamond Education > Cut Grading Classification

Home > Knowledge Base > Diamond Education > Cut Grading Classification

Home > Knowledge Base > Diamond Education > Cut Grading Classification

Cut Grading Classification
Cut Grading Classification
Cut Grading Classification

Diamond Cut Guide - Overview & Grades


Diamond Cut Grading Classification


Currently most laboratories only provide cut grading for round diamonds as it is harder to assess the ideal proportions for fancy shape diamonds. The only laboratory that currently provides cut grades for fancy shaped diamonds is the less well known AGS, which introduced a princess cut grade in 2005 and an emerald cut grade in late 2006.

Based on existing values for the round brilliant and extensive research, we have devised a table of recommended proportions for fancy shapes below. Please note these values are only to be used as a reference or guideline. We have grouped the shapes according to their cut classification type (brilliant, modified brilliant, step and mixed cut).

Diamond Cut Classifications



Select Diamond Cut

Round Princess Oval Heart Radiant Pear Marquise Emerald Asscher Cushion



Round Cut Diamond
Round Brilliant Cut

Brilliant Cut



Brilliant Cut


The round brilliant is the most brilliant of all diamond cuts. Brilliant cuts were first developed by Marcel Tolkowsky (1899-1991) who came from a Belgian family of diamond cutters, and derived the cut from mathematical calculations that maximised the brilliance and dispersion of light.

Since its creation in the early twentieth century, the round brilliant cut has become the most researched and popular of all cuts. It is comprised of 58 facets and naturally follows the crystal shape of a rough diamond therefore designed to give maximum scintillation, beauty and fire. The simplest cut is a single cut, a form of cutting a round diamond with only 18 facets. In the 1980s in Japan, it was discovered that a round brilliant diamond with exceptional symmetry, when viewed through a special viewer displayed a pattern of hearts and arrowheads.

Round Brilliant Cut Diamond


Round Brilliant Cut Diamond Features



Round Brilliant Cut Diamond Features

Round Brilliant Cut Diamond Features.


Round Cut Diamond Grading Classification



Swipe left to see more.
Round Cut Diamond Excellent Very Good Good Fair Poor
×
Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

59 - 62.3 58 - 58.9 or 62.4 - 63.5 57.5 - 57.9 or 63.6 - 64.1 56.5 - 57.4 or 64.2 - 65 <56.5 or >65
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

53 - 58 52 - 53 or 58 - 60 51 or 61 - 64 50 or 65 - 69 <50 or >69
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Very good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Very good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Crown Angle

Refers to the number of degrees between the plane of the table and the bezel facets. The crown angle will determine how much light is reflected into the pavilion at an angle that will allow it to be reflected back up through the crown (where the observer can perceive it).

Learn more about the anatomy of a diamond.

34 - 34.9 32.1 - 33.9 or 35 - 35.5 30.1 - 32 or 36 - 37.9 29 - 30 or 38 - 40.5 <29 or >40.5
×
Diamond Pavilion Depth

The entire portion of the diamond that sits below the girdle. The pavilion usually constitutes the bulk of a diamond's carat weight and consists of the pavilion facets and culet. Pavilion height may be expressed in millimeters, or as a percentage of a diamond's diameter.

Learn more about the anatomy of a diamond.

42.8 - 43.2 42 - 42.7 or 43.3 - 43.9 41 - 41.9 or 44 - 45.5 39 - 40.9 or 45.6 - 48 <39 or >48
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

None Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

1.00 - 1.01 1.00 - 1.01 1.00 - 1.01 1.02 > 1.02

Round Brilliant Cut Diamond Grading Classification.


Princess Cut Diamond
Princess Modified Brilliant Cut

Modified Brilliant Cut



Modified Brilliant Cuts


Any style of diamond cutting other than the round brilliant or single cut is called a fancy cut, or fancy shape. The cuts that have been developed based on the original round brilliant design are known as modified brilliant cuts. Modified brilliants include the princess, radiant, marquise, oval, pear and heart cuts.

Princess Cut Diamond


Princess Cut Diamond Features



Princess Cut Diamond Features

Princess Cut Diamond Features.


Princess Cut Diamond Grading Classification



Swipe left to see more.
Princess Cut Diamond Excellent Very Good Good Fair Poor
×
Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

64 - 75 64 - 75 58 - 63.9 or 75.1 - 80 56 - 57.9 or 80.1 - 84 <56 or >84
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

62 - 72 59 - 66 or 73 - 75 56 - 58 or 76 - 82 53 - 55 or 83 - 85 <53 or >85
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Very Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

Very Small Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

1.00 - 1.03 1.00 - 1.03 1.04 - 1.05 1.06 - 1.08 > 1.08

Princess Cut Diamond Grading Classification.


The ideal proportions of table and depth are much higher for a princess than for a round brilliant cut. On a GIA certificate, the technical name for a princess cut is a modified square - or rectangular brilliant cut. It can have the same number of facets as a round diamond (57), but may have as many as 76 or even up to 144.

Beyond the most popular princess cut, modified brilliants come in a range of other shapes. The radiant cut, which can be square or rectangular usually comes with 70 facets, whilst the oval (which is in effect an elongated round) often has 58 facets. Other shapes include a tip formation such as the pear shape (56-58 facets), heart Shape (usually 56-58 facets), and marquise (56-58 facets).

Other factors to take into account for modified brilliant cuts include:

Bow tie effect - Some fancy shape diamonds have two black triangles across the middle of the diamond that look like a bow tie. Although bow ties are normal in some fancy shapes, a bow tie that is too big diminishes a diamond's beauty. Depending on the size, angle and placement of the diamond's facets, this bow tie can be barely visible ('minimal') or very pronounced. It occurs from the variations in the pavilion facet angles which are longer than they are wide which results in a small amount of light leaking through the diamond. Facets are suppose to alternate between light and dark as the diamond, viewer or light source are moved but with the bow tie effect, certain facets stay relatively dark regardless of the movement.

Girdle Thickness - Girdle width varies considerably more in fancy shapes than in the round brilliant. For example, the marquise, pear and heart cuts shapes tend to have thick girdles or are extremely thick at the tips, or in the cleft of the heart shape. The princess cut, on the other hand, which has square corners, may have an extremely thin girdle. It is generally recommended to avoid extremely thin or thick girdles to avoid chipping at one extreme and retaining excessive weight to the detriment of the size of the diamond.

Oval Cut Diamond
Oval Modified Brilliant Cut

Modified Brilliant Cut



Modified Brilliant Cuts


Any style of diamond cutting other than the round brilliant or single cut is called a fancy cut, or fancy shape. The cuts that have been developed based on the original round brilliant design are known as modified brilliant cuts. Modified brilliants include the princess, radiant, marquise, oval, pear and heart cuts.

Oval Cut Diamond


Oval Cut Diamond Features



Oval Cut Diamond Features

Oval Cut Diamond Features.


Oval Cut Diamond Grading Classification



Swipe left to see more.
Oval Cut Diamond Excellent Very Good Good Fair Poor
×
Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

58 - 62 56 - 57.9 or 62.1 - 66 53 - 55.9 or 66.1 - 71 50 - 52.9 or 71.1 - 74 <50 or >74
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

53 - 63 52 or 64 - 65 51 or 64 - 65 50 or 69 - 70 <50 or >70
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Very Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

None Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

1.35 - 1.50 1.30 - 1.34 or 1.52 - 1.55 1.25 - 1.29 or 1.56 - 1.60 1.20 - 1.24 or 1.61 - 1.65 <1.20 or >1.65

Oval Cut Diamond Grading Classification.


Beyond the most popular princess cut, modified brilliants come in a range of other shapes. The radiant cut, which can be square or rectangular usually comes with 70 facets, whilst the oval (which is in effect an elongated round) often has 58 facets. Other shapes include a tip formation such as the pear shape (56-58 facets), heart Shape (usually 56-58 facets), and marquise (56-58 facets).

Other factors to take into account for modified brilliant cuts include:

Bow tie effect - Some fancy shape diamonds have two black triangles across the middle of the diamond that look like a bow tie. Although bow ties are normal in some fancy shapes, a bow tie that is too big diminishes a diamond's beauty. Depending on the size, angle and placement of the diamond's facets, this bow tie can be barely visible ('minimal') or very pronounced. It occurs from the variations in the pavilion facet angles which are longer than they are wide which results in a small amount of light leaking through the diamond. Facets are suppose to alternate between light and dark as the diamond, viewer or light source are moved but with the bow tie effect, certain facets stay relatively dark regardless of the movement.

Girdle Thickness - Girdle width varies considerably more in fancy shapes than in the round brilliant. For example, the marquise, pear and heart cuts shapes tend to have thick girdles or are extremely thick at the tips, or in the cleft of the heart shape. The princess cut, on the other hand, which has square corners, may have an extremely thin girdle. It is generally recommended to avoid extremely thin or thick girdles to avoid chipping at one extreme and retaining excessive weight to the detriment of the size of the diamond.

Heart Cut Diamond
Heart Modified Brilliant Cut

Modified Brilliant Cut



Modified Brilliant Cuts


Any style of diamond cutting other than the round brilliant or single cut is called a fancy cut, or fancy shape. The cuts that have been developed based on the original round brilliant design are known as modified brilliant cuts. Modified brilliants include the princess, radiant, marquise, oval, pear and heart cuts.

Heart Cut Diamond


Heart Cut Diamond Features



Heart Cut Diamond Features

Heart Cut Diamond Features.


Heart Cut Diamond Grading Classification



Swipe left to see more.
Heart Cut Diamond Excellent Very Good Good Fair Poor
×
Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

58 - 62 56 - 57.9 or 62.1 - 66 53 - 55.9 or 66.1 - 71 50 - 52.9 or 71.1 - 74 <50 or >74
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

53 - 63 52 or 64 - 65 51 or 66 - 68 50 or 69 - 70 <50 or >70
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Very Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

None Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

0.95 - 1.02 0.89 - 0.94 or 1.03 - 1.05 0.83 - 0.94 or 1.03 - 1.05 0.80 - 0.83 or 1.11 - 1.15 <0.80 or >1.15

Heart Cut Diamond Grading Classification.


Beyond the most popular princess cut, modified brilliants come in a range of other shapes. The radiant cut, which can be square or rectangular usually comes with 70 facets, whilst the oval (which is in effect an elongated round) often has 58 facets. Other shapes include a tip formation such as the pear shape (56-58 facets), heart Shape (usually 56-58 facets), and marquise (56-58 facets).

Other factors to take into account for modified brilliant cuts include:

Bow tie effect - Some fancy shape diamonds have two black triangles across the middle of the diamond that look like a bow tie. Although bow ties are normal in some fancy shapes, a bow tie that is too big diminishes a diamond's beauty. Depending on the size, angle and placement of the diamond's facets, this bow tie can be barely visible ('minimal') or very pronounced. It occurs from the variations in the pavilion facet angles which are longer than they are wide which results in a small amount of light leaking through the diamond. Facets are suppose to alternate between light and dark as the diamond, viewer or light source are moved but with the bow tie effect, certain facets stay relatively dark regardless of the movement.

Girdle Thickness - Girdle width varies considerably more in fancy shapes than in the round brilliant. For example, the marquise, pear and heart cuts shapes tend to have thick girdles or are extremely thick at the tips, or in the cleft of the heart shape. The princess cut, on the other hand, which has square corners, may have an extremely thin girdle. It is generally recommended to avoid extremely thin or thick girdles to avoid chipping at one extreme and retaining excessive weight to the detriment of the size of the diamond.

Radiant Cut Diamond
Radiant Modified Brilliant Cut

Modified Brilliant Cut



Modified Brilliant Cuts


Any style of diamond cutting other than the round brilliant or single cut is called a fancy cut, or fancy shape. The cuts that have been developed based on the original round brilliant design are known as modified brilliant cuts. Modified brilliants include the princess, radiant, marquise, oval, pear and heart cuts.

Radiant Cut Diamond


Radiant Cut Diamond Features



Radiant Cut Diamond Features

Radiant Cut Diamond Features.


Radiant Cut Diamond Grading Classification



Swipe left to see more.
Radiant Cut Diamond Excellent Very Good Good Fair Poor
×
Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

61 - 67 59 - 60.9 or 67.1 - 70 57 - 58.9 or 70.1 - 74 54 - 56.9 or 74.1 - 79 <54 or >79
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

61 - 69 57 - 60 or 70 - 72 54 - 56 or 73 - 74 51 - 53 or 75 - 79 <51 or >79
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Very Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

None Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

Square
1.00 - 1.03 1.00 - 1.03 1.04 - 1.05 1.06 - 1.08 > 1.08
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

Rectangle
1.20 - 1.30 1.15 - 1.19 or 1.31 - 1.35 1.10 - 1.14 or 1.36 - 1.40 1.08 - 1.09 or 1.41 - 1.50 <1.08 or >1.50

Radiant Cut Diamond Grading Classification.


There are diverse preferences when it comes to shape in radiant cut diamonds, from a perfectly square 1.00 length to width ratio (any ratio of 1.05 or less will appear square to the naked eye), to a more traditional rectangle. The rectangular radiant cut is an excellent option for buyers who like the emerald cut shape, but want something with the brilliance of a round. The square radiant looks very similar to a princess cut, but with cropped corners. Once set, a square radiant and a princess look virtually identical, since the prongs cover the corners.

Beyond the most popular princess cut, modified brilliants come in a range of other shapes. The radiant cut, which can be square or rectangular usually comes with 70 facets, whilst the oval (which is in effect an elongated round) often has 58 facets. Other shapes include a tip formation such as the pear shape (56-58 facets), heart Shape (usually 56-58 facets), and marquise (56-58 facets).

Other factors to take into account for modified brilliant cuts include:

Bow tie effect - Some fancy shape diamonds have two black triangles across the middle of the diamond that look like a bow tie. Although bow ties are normal in some fancy shapes, a bow tie that is too big diminishes a diamond's beauty. Depending on the size, angle and placement of the diamond's facets, this bow tie can be barely visible ('minimal') or very pronounced. It occurs from the variations in the pavilion facet angles which are longer than they are wide which results in a small amount of light leaking through the diamond. Facets are suppose to alternate between light and dark as the diamond, viewer or light source are moved but with the bow tie effect, certain facets stay relatively dark regardless of the movement.

Girdle Thickness - Girdle width varies considerably more in fancy shapes than in the round brilliant. For example, the marquise, pear and heart cuts shapes tend to have thick girdles or are extremely thick at the tips, or in the cleft of the heart shape. The princess cut, on the other hand, which has square corners, may have an extremely thin girdle. It is generally recommended to avoid extremely thin or thick girdles to avoid chipping at one extreme and retaining excessive weight to the detriment of the size of the diamond.

Pear Cut Diamond
Pear Modified Brilliant Cut

Modified Brilliant Cut



Modified Brilliant Cuts


Any style of diamond cutting other than the round brilliant or single cut is called a fancy cut, or fancy shape. The cuts that have been developed based on the original round brilliant design are known as modified brilliant cuts. Modified brilliants include the princess, radiant, marquise, oval, pear and heart cuts.

Pear Cut Diamond


Pear Cut Diamond Features



Pear Cut Diamond Features

Pear Cut Diamond Features.


Pear Cut Diamond Grading Classification



Swipe left to see more.
Pear Cut Diamond Excellent Very Good Good Fair Poor
×
Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

58 - 62 56 - 57.9 or 62.1 - 66 53 - 55.9 or 66.1 - 71 50 - 52.9 or 71.1 - 74 <50 or >74
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

53 - 63 52 or 64 - 65 51 or 66 - 68 50 or 69 - 70 <50 or >70
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Very Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

None Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

1.45 - 1.55 1.40 - 1.44 or 1.56 - 1.65 1.35 - 1.39 or 1.66 - 1.80 1.25 - 1.34 or 1.81 - 2.00 <1.25 or >2.00


Pear Cut Diamond Grading Classification.


Beyond the most popular princess cut, modified brilliants come in a range of other shapes. The radiant cut, which can be square or rectangular usually comes with 70 facets, whilst the oval (which is in effect an elongated round) often has 58 facets. Other shapes include a tip formation such as the pear shape (56-58 facets), heart Shape (usually 56-58 facets), and marquise (56-58 facets).

Other factors to take into account for modified brilliant cuts include:

Bow tie effect - Some fancy shape diamonds have two black triangles across the middle of the diamond that look like a bow tie. Although bow ties are normal in some fancy shapes, a bow tie that is too big diminishes a diamond's beauty. Depending on the size, angle and placement of the diamond's facets, this bow tie can be barely visible ('minimal') or very pronounced. It occurs from the variations in the pavilion facet angles which are longer than they are wide which results in a small amount of light leaking through the diamond. Facets are suppose to alternate between light and dark as the diamond, viewer or light source are moved but with the bow tie effect, certain facets stay relatively dark regardless of the movement.

Girdle Thickness - Girdle width varies considerably more in fancy shapes than in the round brilliant. For example, the marquise, pear and heart cuts shapes tend to have thick girdles or are extremely thick at the tips, or in the cleft of the heart shape. The princess cut, on the other hand, which has square corners, may have an extremely thin girdle. It is generally recommended to avoid extremely thin or thick girdles to avoid chipping at one extreme and retaining excessive weight to the detriment of the size of the diamond.

Marquise Cut Diamond
Marquise Modified Brilliant Cut

Modified Brilliant Cut



Modified Brilliant Cuts


Any style of diamond cutting other than the round brilliant or single cut is called a fancy cut, or fancy shape. The cuts that have been developed based on the original round brilliant design are known as modified brilliant cuts. Modified brilliants include the princess, radiant, marquise, oval, pear and heart cuts.

Marquise Cut Diamond


Marquise Cut Diamond Features



Marquise Cut Diamond Features

Marquise Cut Diamond Features.


Marquise Cut Diamond Grading Classification



Swipe left to see more.
Marquise Cut Diamond Excellent Very Good Good Fair Poor
×
Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

58 - 62 56 - 57.9 or 62.1 - 66 53 - 55.9 or 66.1 - 71 50 - 52.9 or 71.1 - 74 <50 or >74
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

53 - 63 52 or 64 - 65 51 or 66 - 68 50 or 69 - 70 <50 or >70
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Very Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

None Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

1.85 - 2.00 1.75 - 1.84 or 2.01 - 2.15 1.65 - 1.74 or 2.16 - 2.30 1.55 - 1.64 or 2.31 - 2.45 <1.55 or >2.45

Marquise Cut Diamond Grading Classification.


Beyond the most popular princess cut, modified brilliants come in a range of other shapes. The radiant cut, which can be square or rectangular usually comes with 70 facets, whilst the oval (which is in effect an elongated round) often has 58 facets. Other shapes include a tip formation such as the pear shape (56-58 facets), heart Shape (usually 56-58 facets), and marquise (56-58 facets).

Other factors to take into account for modified brilliant cuts include:

Bow tie effect - Some fancy shape diamonds have two black triangles across the middle of the diamond that look like a bow tie. Although bow ties are normal in some fancy shapes, a bow tie that is too big diminishes a diamond's beauty. Depending on the size, angle and placement of the diamond's facets, this bow tie can be barely visible ('minimal') or very pronounced. It occurs from the variations in the pavilion facet angles which are longer than they are wide which results in a small amount of light leaking through the diamond. Facets are suppose to alternate between light and dark as the diamond, viewer or light source are moved but with the bow tie effect, certain facets stay relatively dark regardless of the movement.

Girdle Thickness - Girdle width varies considerably more in fancy shapes than in the round brilliant. For example, the marquise, pear and heart cuts shapes tend to have thick girdles or are extremely thick at the tips, or in the cleft of the heart shape. The princess cut, on the other hand, which has square corners, may have an extremely thin girdle. It is generally recommended to avoid extremely thin or thick girdles to avoid chipping at one extreme and retaining excessive weight to the detriment of the size of the diamond.

Emerald Cut Diamond
Emerald Step Cut

Step Cut



Step Cuts


Step cuts mainly include the emerald and asscher cuts. They have sloping, four-sided facets that are cut below the table and run parallel to the diamond's girdle. Their corners are generally cut, as square corners would be weaker and could cause the diamond to fracture. The advantage of step cuts is that they preserve more of the weight of the raw diamond than brilliant cuts, however they can also make inclusions and flaws appear more obvious. Because both the pavilion and crown are comparatively shallow, step cut stones are generally not as bright or fiery as brilliant cut stones, but they do accentuate a diamond's clarity and give the diamond a less cluttered and a purer or more transparent appearance.

Because of the transparency, cut grades for step cuts are generally considered less important than for brilliant cuts.

Emerald Cut Diamond


Emerald Cut Diamond Features



Emerald Cut Diamond Features

Emerald Cut Diamond Features.


Emerald Cut Diamond Grading Classification



Swipe left to see more.
Emerald Cut Diamond Excellent Very Good Good Fair Poor
×
Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

61 - 67 59 - 60.9 or 67.1 - 70 57 - 58.9 or 70.1 - 74 54 - 56.9 or 74.1 - 79 <54 or >79
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

61 - 69 57 - 60 or 70 - 72 54 - 56 or 73 - 74 51 - 53 or 75 - 79 <51 or >79
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Very Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

None Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

Square
1.00 - 1.03 1.00 - 1.03 1.04 - 1.05 1.06 - 1.08 > 1.08
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

Rectangle
1.40 - 1.50 1.30 - 1.39 or 1.51 - 1.60 1.20 - 1.29 or 1.61 - 1.80 1.15 - 1.19 or 1.81 - 1.90 <1.15 or >1.90

Emerald Cut Diamond Grading Classification.


Emerald cut diamonds vary from nearly square to a narrow rectangle. The classic emerald cut diamond has a length to width ratio of around 1.50. If you prefer the look of the square emerald cut diamond, be sure to consider the asscher cut as well (which has a very similar appearance, and is defined by GIA as a square cut emerald).

Asscher Cut Diamond
Asscher Step Cut

Step Cut



Step Cuts


Step cuts mainly include the emerald and asscher cuts. They have sloping, four-sided facets that are cut below the table and run parallel to the diamond's girdle. Their corners are generally cut, as square corners would be weaker and could cause the diamond to fracture. The advantage of step cuts is that they preserve more of the weight of the raw diamond than brilliant cuts, however they can also make inclusions and flaws appear more obvious. Because both the pavilion and crown are comparatively shallow, step cut stones are generally not as bright or fiery as brilliant cut stones, but they do accentuate a diamond's clarity and give the diamond a less cluttered and a purer or more transparent appearance.

Because of the transparency, cut grades for step cuts are generally considered less important than for brilliant cuts.

Asscher Cut Diamond


Asscher Cut Diamond Features



Asscher Cut Diamond Features

Asscher Cut Diamond Features.


Asscher Cut Diamond Grading Classification



Swipe left to see more.
Asscher Cut Diamond Excellent Very Good Good Fair Poor
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Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

61 - 67 59 - 60.9 or 67.1 - 70 57 - 58.9 or 70.1 - 74 54 - 56.9 or 74.1 - 79 <54 or >79
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

61 - 69 57 - 60 or 70 - 72 54 - 56 or 73 - 74 51 - 53 or 75 - 79 <51 or >79
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Very Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

None Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

1.00 - 1.03 1.00 - 1.03 1.04 - 1.05 1.06 - 1.08 > 1.08

Asscher Cut Diamond Grading Classification.


Cushion Cut Diamond
Cushion Mixed Cut

Mixed Cut



Mixed Cuts (Cushion Cuts)


While the classic cushion cut diamond is a square (with a length to width ratio of 1.00), they are often found in slightly rectangular shapes as well. The most popular shape is a slight rectangle of 1.10-1.20 length to width, however personal preference should dictate choice.

The cushion cut is the most common mixed cut, combining faceting elements from both the modified brilliant and step cuts allowing it to ensure weight preservation from the step cuts while at the same time enjoying the optical effects of brilliants. Typically the crown is fashioned like a brilliant cut and the pavilion more like a step cut. Although mixed cuts are all relatively new, dating back to the 1960s, the cushion shape is much older.

Cushion Cut Diamond


Cushion Cut Diamond Features



Cushion Cut Diamond Features

Cushion Cut Diamond Features.


Cushion Cut Diamond Grading Classification



Swipe left to see more.
Cushion Cut Diamond Excellent Very Good Good Fair Poor
×
Diamond Depth %

Depth refers to the distance between the culet and the table when a diamond is viewed from the side.

The depth % of a diamond is calculated by dividing the depth of the diamond by the width of the diamond. So, if a diamond is 3 mm in depth, and 4.5 mm in width, its depth % is 66.7.

The lower the depth %, the larger a diamond of a given carat weight will appear when viewed from above (since more of the diamond's size is in its width vs. in its depth).

Depth % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just depth %). Once two diamonds of equal cut are being compared, consider depth % as a further refinement.

Learn more about the anatomy of a diamond.

61 - 67 58 - 60.9 or 67.1 - 70 56 - 57.9 or 70.1 - 71 54 - 55.9 or 71.1 - 73 <54 or >73
×
Diamond Table %

The table is the uppermost, flat surface of a diamond, which runs parallel to the plane of the girdle.

The table % of a diamond is calculated by dividing the width of the table facet by the width of the diamond. So, if the table facet is 3 mm across, and the diamond is 4.5 mm wide, its table % is 66.7.

Table % is incorporated in the cut grade of a diamond. For this reason, when purchasing a diamond, use the cut grade first (since it balances multiple measurements, not just table %). Once two diamonds of equal cut are being compared, consider table % as a further refinement.

Learn more about the anatomy of a diamond.

61 - 67 58 - 60 or 68 - 67 56 - 57 or 71 54 - 55 or 72 - 73 <54 or >73
×
Diamond Symmetry

A diamond's symmetry is the arrangement, size, and shaping of diamond's facets. The facets are the flat planes that run along the surfaces of the diamond. Symmetry is angles and lines that form the placement of the facets. Nowadays, symmetry is completely controlled by the manufacturing process. Machines very carefully cut diamonds to produce the most accurate shapes. However, at times the diamond cutter will leave a symmetry imperfection in the diamond in order to prevent a different inclusion from showing in the finished diamond. Symmetry is a subset of the diamond's cut grade.

Learn more about diamond symmetry.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Polish

The term "polish" refers to the overall condition of the surfaces of a finished diamond. A rating is assigned based on the amount of polishing lines that are visible. These polishing lines are caused by very small diamond crystals which are embedded in the polishing wheels used by diamond cutters to polish the surface of the diamond after cutting. Diamond polish is important because it can affect the degree to which light is able to pass through a diamond, rendering it more or less brilliant. Diamonds that are laboratory certified with a good, very good, or excellent polish rating are the most desirable. Diamonds that have poor polish will be less brilliant and not as desirable or valuable. Reputable jewellers diamonds are graded after examining the diamond facet by facet.

Learn more about diamond polish.

Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
×
Diamond Girdle

The girdle is the outer edge of the diamond, where the crown (top) meets the pavilion (bottom).

A girdle may be faceted (a series of tiny polished sides going around the diamond), bruted (a single continuous unpolished surface going round the diamond; no longer common), or polished (a bruted girdle that has been polished smooth). Whether a girdle is faceted, bruted, or polished usually has no impact on the appearance or value of the diamond.

The girdle is described according to its width. Often, the width of the girdle varies at different points around the diamond, and is quoted in a range designating the thinnest and thickest point along the girdle (e.g. "Thin - Medium" means the diamond's girdle varies in width from thin at the narrowest point to medium at the widest point).

Learn more about the anatomy of a diamond.

Very Thin - Slightly Thick Very Thin - Slightly Thick Very Thin - Thick Very Thin - Very Thick Ex. Thin - Ex. Thick
×
Diamond Culet

The culet (pronounced cue-let) is the small area at the bottom of a diamond's pavilion. The culet can be a point or a very small facet sitting parallel to the table.

The culet size as determined by the GIA, is shown using the following scale:

None, Very Small, Small, Medium, Slightly Large, Large, Very Large.

Any culet size of Medium or smaller will be invisible to the naked eye, and have no negative impact on a diamond's appearance. However, if a culet is Slightly Large or larger, it may allow light entering from the crown to pass straight through the culet facet, reducing the diamond's brilliance. This may also make the culet appear as an inclusion, or create a dead area on the diamond where the light is escaping through the bottom.

Learn more about the anatomy of a diamond.

None Very Small Small Medium > Medium
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

Square
1.00 - 1.03 1.00 - 1.03 1.04 - 1.05 1.06 - 1.08 > 1.08
×
Diamond L/W Ratio

The length to width (L/W) ratio is calculated by dividing a diamond's length (the longer measure) by its width (the shorter measure that runs perpendicular to length).

For example, an Oval Cut diamond that is 5.00 mm in length and 3.3 mm in width will have a L/W ratio of 1.50 (5.00/3.33). A perfectly round or square diamond will have a length to width ratio of 1.00, but many will be off slightly since they are often not perfectly cut. Any L/W ratio of 1.05 or less will appear perfectly round or square to the naked eye.

L/W ratio is more commonly used in fancy shapes. There is no "ideal" L/W ratio in a fancy shape diamond. What is important is what looks pleasing to you.

Rectangle
1.15 - 1.20 1.10 - 1.14 or 1.21 - 1.30 1.10 - 1.14 or 1.21 - 1.30 1.08 - 1.09 or 1.31 - 1.50 <1.08 or >1.50

Cushion Cut Diamond Grading Classification.


The cushion is one of the least uniform cut diamonds and comes in many different variations. In general we can separate the cut into two categories, the cushion brilliant cuts and the cushion modified brilliant cuts.


Cushion Cut Diamonds - The Three Different Types


Cushion Cut Types

Cushion Cut Types.


The cushion cut diamond is one of the oldest shapes and cutting styles, and has continually ranked high in popularity for engagement rings. Over the cushion's long history there have been many evolved takes on the cutting style. The first diamonds being cut in the cushion style date back to the early 1700's. This cutting style is known as the Old Mine cut, named after the origin, the Brazilian Diamond Mines. In that time with limited technology, it was a very difficult process to cut a diamond, so the main priority for most diamond cutters was to save time and money. Thus many of the diamonds being cut are meant to retain as much rough weight as possible. The defining characteristics of an Old Mine cut diamond are a squarish shape with a high crown (top), small table, deep pavilion (bottom), and a large culet.

As faceting technology continued to evolve, more precise cuts were able to be developed throughout the 20th century. Modern-day cushion brilliant cut diamonds are square or squarish-rectangular shapes with curved sides and either rounded or pointed corners. Typically, this cut will have four or eight mains, which are kite-shaped facets between the girdle and the culet. Sometimes the cut is modified to include extra facets on the crown or pavilion, in which case the cut is called modified cushion cut brilliant. The Gemological Institute of America (GIA) has made distinctions of these 2 kinds of cushion based on technical faceting standard. These standards and differences should be taken into consideration, and you should choose the diamond that is most aesthetically pleasing to you.

Cushion Brilliant


The cushion brilliant is the predecessor of the cushion modified, and one of its defining characteristics is the pavilion mains touching the girdle(outer edge) of the diamond. This faceting arrangement is very similar to a round brilliant diamond, where pavilion mains play a huge role in the diamond's fire. The cushion brilliant can have 4, 6, 8, or 10 pavilion mains and 57 facets total like a round diamond. Having more pavilions will result in a more refractive and fiery diamond. This is the most requested cutting style of cushion, from jewellers and is much rarer to find in comparison to the cushion modified.

Cushion Brilliant

Cushion Brilliant.


Cushion Modified Brilliant


The Cushion Modified Brilliant is a variation on the original cushion brilliant shape. This type of cushion is the most commonly seen in the market. Diamond cutters save more weight when cutting them from a rough diamond crystal, and will usually be less expensive than a cushion brilliant of the same quality. This cutting style has 4 shortened pavilion mains with an extra row of facets between the pavilion mains and girdle. In a diamond, pavilion mains generate the bold flashes of light and make a really diamond pop. When the mains are shortened so is the returning amount of light. Instead of driving the light all the way out it results in short sparkles giving it the "crushed ice" look.

Cushion Modified Brilliant

Cushion Modified Brilliant.


Cushion Hybrid Brilliant / X Factor


The Cushion Hybrid Brilliant takes the best from both worlds. The cutting style of this cushion features 4 extended pavilion mains and has extra faceting next to each main. These additional facets provide more sparkle and fire to the diamond while the top of the diamond still features larger faceting like the brilliant round cut. With this cut, diamond cutters are now able to create cushion cut diamonds that retain the carat weight and appearance of a modified cushion with the look of a classic cushion brilliant. This results in a more brilliant appearance while still having short sparkly light streams.

Cushion Hybrid Brilliant / X Factor

Cushion Hybrid Brilliant / X Factor.



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