04-12-2020
The International Gemological Institute (IGI) Hong Kong recently certified a 12.75-carat laboratory-grown diamond created by Chinese firm Zhengshi Technology Shanghai Co, Ltd which was said to be the world’s largest CVD diamond ever produced.
The polished stone, cut from a 46.20-carat CVD-grown rough crystal, “was Type IIa, giving it exceptional chemical purity and transparency, with VVS2 clarity, F color, and triple-excellent marks in cut-quality and finish”, according to IGI Hong Kong.
Bob Van Es, managing director of the laboratory said: “A laboratory grown diamond of this carat weight, with such a high clarity and colour grade is a remarkable achievement in the area of CVD cultivated diamond technology. As the industry leader in the certification of laboratory grown diamonds, IGI will continue to follow these new developments closely.” (Photo courtesy: IGI Hong Kong)
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