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Record Lab-Grown Stone Turns Up at GIA

Feb 2, 2022 7:29 AM   By Rapaport News
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The Gemological Institute of America (GIA) recently graded what it claims to be the largest known synthetic diamond created using chemical vapor deposition (CVD).

The stone, produced by Shanghai Zhengshi Technology, is a princess-cut, 16.41-carat, G-color, VVS2-clarity lab-grown diamond, GIA said Wednesday. Spectroscopic readings the GIA performed confirmed the stone had no post-growth treatments to improve the color, it noted.

“The first CVD diamond I examined in 2003 was a 0.23-carat pear shape, with clear brown color,” said Wuyi Wang, GIA vice president of research and development. “This 16.41-carat laboratory-grown diamond demonstrates the advances in CVD growth technology. This achievement has important implications for the many scientific and industrial applications for high-quality laboratory-grown diamonds.”

The previous record for a synthetic diamond grown using CVD was held by an emerald cut, 14.60-carat, F-color, VS2-clarity diamond, which was produced in India and graded by the International Gemological Institute (IGI). Meanwhile, the record for the largest lab-grown diamond the GIA has examined was in 2019 for a cushion-cut, 20.23-carat, fancy-vivid-yellowish-orange, VS2-clarity stone made using High-Pressure-High-Temperature (HPHT).

Image: The 16.41-carat lab-grown diamond. (Gemological Institute of America)
Tags: chemical vapor deposition, cvd, diamond, Gemological Institute of America, GIA, High-Pressure-High-Temperature, IGI, International Gemological Institute, lab-grown, Rapaport News, Shanghai Zhengshi Technology, Wuyi Wang
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