Reputable jewellers pink lab-created diamonds are optically, chemically and physically identical to pink earth mined diamonds but are offered free of conflict and about 5% of the cost. They are typically readily available in sizes below 2.00 carats and range in color from Fancy Pink to Fancy Deep Pink.
Unlike white, blue and yellow lab-created diamonds, which get their color during the growing process, pink diamonds get their color from a post-growth treatment process referred to as irradiation and annealing.
Certain lighter yellow diamonds are most commonly used to create pinks. By showering the diamond with electrons and neutrons (irradiation), producers can alter the diamond's crystal lattice structure and create a new colored center. During the second step, annealing, the stone is heated to help smooth out the alterations created from the irradiation and helps achieve the diamond's finished color.
Additional colors like purple, red and green are available and are produced post treatment using the same process as pinks. The color created during the treatment process is permanent and secure under normal wear and tear conditions. In the event of setting, repairing or servicing a color treated diamond, care should be taken when being exposed to high temperatures like a jeweller's torch. Exposure to extreme temperatures may cause color discrepancies.
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Mined pink diamonds are the rarest in the world. The majority of pink diamonds come from Australia. The extreme limited availability puts the cost of these pink diamonds between $56,000 to $150,000 per carat. A treated pink lab-created diamond costs between $5,000 and $10,000 per carat. The price per carat weighs heavily on the color of the diamond itself. On average, a pink lab-created diamond is about 5% the cost of a pink mined diamond.
The large majority of lab-created pink diamonds will be finished or shaped in the same manner as yellow grown diamonds. A lab-created pink diamond starts as a yellow grown diamond. A grown yellow diamond's rough has a truncated octahedral shape. Square shapes like radiant, princess, cushion, asscher and emerald are typically used to yield the most from the rough. Round shape diamonds are also available. Due to the square nature of the pink rough, elongated shapes like oval, marquise and pear are not typically produced.
The clarity of a pink diamond is dependent upon its color. Pink colors that are fuller in saturation or have more of the pink color in them will allow for a lower clarity while a soft or light pink may require a higher clarity. In any case, as long as the diamond's inclusions are not visible to the naked eye (eye-clean), you should be safe. Clarity will affect the price, so in many cases, buying a diamond that is eye-clean over one with a higher clarity grade will not only save you money, but it will look just as good when being viewed in normal conditions.