The Gemological Institute of America (GIA) recently graded the largest known synthetic diamond to be created using chemical vapor deposition (CVD), it claimed Wednesday.
The stone, produced by Shanghai Zhengshi Technology, is a princess-cut, 16.41 carat, G colour, VVS2 clarity lab grown diamond. 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 colour,” 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 colour, 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).
Source: Diamonds.net