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Grown by Mumbai, India-based Ethereal Green Diamond LLP and submitted to GIA’s lab in Hong Kong, the diamond weighs 34.59 carats and measures 24.94 × 13.95 × 9.39 mm.
“This 34.59-carat CVD laboratory-grown diamond is the biggest faceted laboratory-grown diamond GIA has ever seen, CVD or HPHT,” GIA Vice President of Analysis and Growth Wuyi Wang mentioned.
Two staff at GIA Hong Kong, senior workers gemologist Ka Wing Tam and supervisor of diamond identification Terry “Ping Yu” Poon, detailed the examination of the stone in a analysis notice GIA published online last week. The notice additionally will seem in the summertime 2023 print version of Gems & Gemology.
The emerald-cut diamond was graded G colour and VS2 readability, with small black graphite inclusions contained in the physique of the diamond and others forming clusters between the diamond’s progress layers.
Fluorescence imaging performed utilizing the DiamondView, one of many devices De Beers Group developed for diamond detection, revealed the expansion striations usually seen in CVD diamonds, the analysis notes states.
As well as, microscopic remark confirmed a “weak oily or wavy” graining within the desk side, a characteristic generally seen in gem-quality CVD diamonds.
The practically 35-carat diamond is greater than twice the dimensions of the 16.41-carat princess-cut lab-grown diamond created by Shanghai Zhengshi Expertise Co. Ltd. and examined at GIA’s Carlsbad lab in early 2022.
On the time, that diamond was mentioned to be largest known CVD-grown diamond in the world, although one other Indian firm exhibited two bigger lab-grown diamonds on the JCK present in June final 12 months.
GreenLab Diamonds LLP introduced three massive lab-grown diamonds to Las Vegas, a trio that included the 20.24-carat emerald-cut “Shivaya” and a 27.27-carat marquise step-cut known as the “Om.” The Worldwide Gemological Institute graded the stones.
GIA known as the creation of this 34.59-carat diamond a “milestone” in CVD progress whereas noting, “Mined diamonds with comparable measurement and high quality are very uncommon.”
It did, nonetheless, spotlight one key distinction between the 16-carat diamond it examined final 12 months and the a lot bigger lab-grown diamond that simply got here into its Hong Kong facility.
The 16-carat, princess-cut lab-grown diamond is G colour, VVS2 readability and was not handled to enhance its colour—which is uncommon for CVD diamonds—whereas GIA researchers confirmed the 34-carat diamond underwent post-growth HPHT annealing to bump it as much as a G.
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