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Lab Grades Its Largest CVD Diamond

International Gemological Institute says 12.75-carat synthetic stone has F color and VVS2 clarity.
Nov 26, 2020 4:02 AM   By Rapaport News
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RAPAPORT... The International Gemological Institute’s (IGI) Hong Kong laboratory has graded a 12.75-carat synthetic diamond, the largest chemical vapor deposition (CVD) stone it has ever received.

The lab-grown stone, cut from a 46.20-carat rough, has F color and VVS2 clarity, and is type IIa, the IGI said Monday. It was created by Shanghai Zhengshi Technology Co., which claims it is the largest lab-grown diamond ever produced.

“A laboratory-grown diamond of this carat weight, with such a high clarity and color grade, is a remarkable achievement in CVD-cultivated diamond technology,” noted IGI Hong Kong managing director Bob Van Es.

Last month, IGI reported it had graded a 115.65-carat, black synthetic diamond created using High Pressure-High Temperature (HPHT). That stone ranked as the largest lab-grown diamond of its color, IGI added.

Image: The 12.75-carat CVD diamond. (International Gemological Institute)
Tags: chemical vapor deposition, CVD diamond, IGI, International Gemological Institute, Rapaport News, Shanghai Zhengshi Technology Co
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