Colorless Diamonds > Radiant Cut Diamonds

Radiant Cut Diamonds
Radiant Cut Diamonds
Radiant Cut Diamond Ring
Radiant Cut Diamond Ring.


Radiant Cut Diamond


The radiant cut diamond combines the silhouette of an emerald cut diamond with the fire and sparkle of a round brilliant cut diamond. Due to its design, this shape requires more carat weight in the depth to maximize brilliance.

A square or rectangular shaped hybrid cut that combines the brilliance and depth of the round, emerald and princess cuts, the radiant is the most brilliant of all the squared shapes making it both a beautiful and dramatic choice.

Radiant Cut Diamonds


The Basics


Also referred to as: SQUARE - OR RECTANGULAR MODIFIED BRILLIANT


Radiant Cut Diamond Basics


Radiant Cut Quick Guide


Unique Features

Signature trimmed edges, brilliant step cut

Facets

Usually 70

L/W Ratio

1.00 - 1.05 (square) > 1.05 - 1.50 (rectangular)

Origin

1977

Expert Tip

Hides inclusions well




Features



Radiant Cut Diamond Features

The Radiant is a unique and hybrid cut comprised of 70 facets and distinctive trimmed edges. Square-shaped Radiants typically have ratios between 1.00 and 1.05 while rectangular Radiants can have ratios from over 1.05 anywhere up to 1.50.

Its versatile design combines the brilliance and depth of the round, emerald and princess cuts making it a popular choice for all types of jewellery.

As it is a patented cut, it may be referred to as a Cut-Cornered Square on a laboratory certificate (eg. GIA or AGS), or a Rectangular Brilliant if it has a ratio greater than 1.05.

Expert Advice


Because of its extra facets, the Radiant cut can disperse more light through the stone making it one of the most brilliant of all square and rectangular shaped stones. It also hides inclusions more efficiently than other shapes. As it is a hybrid cut combining the features of both brilliant and step cuts, the Radiant is the ideal compromise and the perfect solution for someone who wants to have it all. 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.

The radiant cut diamond is the first square cut (the second being the princess) to have a complete brilliant cut facet pattern applied to both the crown and pavilion, creating a vibrant and lively square diamond. First popular in the 1980's, the cropped corner square shape of the radiant is a nice bridge between a cushion and a princess cut, and for that reason looks beautiful set with both rounded or square cornered diamonds. In longer (more rectangular) radiant cut diamonds, a bow-tie effect is more likely (although not as common as in oval, marquise, and pear cuts), varying from near invisible to severe. The visibility of a bow-tie effect cannot be ascertained by reviewing the diamond certificate or dimensions, but only upon visual inspection.

The chart below serves as a general guideline for evaluating the cut of a radiant cut diamond:

Radiant Diamond - Cut Guide



Radiant Cut Excellent Very Good Good Fair Poor
Depth % 62 to 68 58 to 70 57 to 75 56 to 80 >56 or <80
Table % 58 to 65 56 to 70 54 to 75 53 to 79 >53 or <79
Symmetry Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
Polish Good to excellent Good to excellent Good to excellent Fair to Excellent Poor to Excellent
Girdle Very Thin - Sl Thick Very Thin - Sl Thick Very Thin to Thick Very Thin to Very Thick Ex. Thin to Ex. Thick
Culet None Very Small Small Medium > Medium
L/W Ratio Square 1.00 to 1.03 1.00 to 1.03 1.04 to 1.05 1.06 to 1.08 > 1.08
L/W Ratio Rectangle 1.20 to 1.30 1.10 to 1.40 1.10 to 1.40 1.08 to 1.50 < 1.08 or > 1.50


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.

Evaluating color in radiant cut diamonds is subjective. Keep in mind that many buyers may actually prefer the ever so slightly warmer colors of a G-H diamond over the cool colorlessness of a D-F diamond. In fact, most of the premium in price associated with radiant cut diamonds at the higher end of the color scale is driven by supply and demand; customers want the D-F color grades, and are willing to pay a premium to get them. In a world without diamond color grading, the price premium for higher grades would be much lower, as the actual differences in color are difficult to perceive. The color chart below provides a general guide for evaluating color in radiant cut diamonds:

Radiant Diamond - Color Guide





Radiant Cut Excellent Very Good Good Fair Poor
< .50 ct. D - G H - I J - K L - M > M
.51-1.0 ct. D - F G H - I J - K > K
1.0-2.0 ct. D - F D - F G - H I - J > J
> 2.0 ct. D - F D - F G H - I > I
Fluorescence None Faint - Med Strong Very Strong Very Strong


Like color, evaluating clarity in radiant cut diamonds is subjective. GIA provides excellent help with their clarity grades. Still, it is important to understand that each customer will have a unique standard for clarity. Some may be perfectly comfortable with an inclusion as long as they cannot easily see it. Others may insist on a more technically flawless appearance. Because of its brilliance, a radiant cut is more forgiving of inclusions than other square cuts (like asscher and emerald), especially when viewed with the naked eye. The clarity chart below provides a general guide for evaluating clarity in radiant cut diamonds:

Radiant Diamond - Clarity Guide



Radiant Cut Excellent Very Good Good Fair Poor
< .50 ct. FL - VS2 SI1 - SI2 I1 I2 > I2
.51-1.0 ct. FL - VS1 VS2 - SI1 SI2 I1 - I2 > I2
1.0-2.0 ct. FL - VVS2 VS1 - VS2 SI1 - SI2 I1 > I1
> 2.0 ct. FL - VVS2 VS1 - VS2 SI1 SI2 > SI2


History & Background


The first Radiant cut was designed by Henry Grossbard of the Radiant Cut Diamond Company (RCDC) in 1977. Prior to this invention, all diamonds with square or step cut edges appeared less brilliant.

Grossbard invented a hybrid cutting style that revolutionised the industry's perceptions towards square or rectangular stones as he managed to create a step cut diamond that possessed equal brilliance to triangular faceted diamonds such as the oval and pear.

The Radiant is also the first cut to have a brilliant-facet pattern applied to both the crown & pavilion. RCDC launched the Original Radiant Cut diamond brand in 2002.


Radiant Cut Diamond history