04 Dec 2022
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GIA examines world’s largest CVD diamond
A G-colour VVS2 clarity, 16.41-carat laboratory-grown diamond reaches GIA for assessment
By: Diamond World News Service
Feb 11 2022 3:19PM
Reference: 26165  


The Gemological Institute of America (GIA) reported a record-breaking CVD diamond that had reached them for study. This 16.41-carat laboratory-grown diamond that is seen in the picture above is believed to be the largest ever created using the chemical vapor deposition (CVD) method has been looked at by GIA. The lab says the princess-cut stone, which was grown by Shanghai Zhengshi Technology Co., has the “observable characteristics” of a diamond produced using CVD methods. It was examined by GIA’s vice-president of research and development, Wuyi Wang, PhD.

“The first CVD diamond I examined in 2003 was a 0.23-carat pear shape with clear brown colour,” Dr. Wang says. “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.” Detailed spectroscopic readings confirmed that the G-colour, VVS2 clarity diamond was not treated post-growth to improve its colour.

“GIA has examined thousands of laboratory-grown diamonds since the first gemmological description of them by Robert Crowningshield in 1971,” says the group’s executive vice-president and chief laboratory and research officer, Tom Moses. “In the decades since, we have shared the results of our detailed research; this is an important aspect of our consumer protection mission.”A brief report by Wang and research associates, Stephanie Persaud and Elina Myagkaya, is available on GIA’s website. It will also be published in the lab’s quarterly journal, Gems & Gemology.

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