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China Breaks Record with 16.41-ct CVD Diamond

Post Date: 08 Feb 2022    Viewed: 908

A Chinese lab grown company has produced the largest ever polished diamond by the newer chemical vapor deposition (CVD) method, says GIA.

The 16.41-carat princess-cut gem (G/VVS2) was produced by Shanghai Zhengshi Technology.

Detailed spectroscopic readings confirmed there was no post-growth treatment to improve the color.

It broke a record held by an emerald 14.60-carat diamond (F/VS2) produced by Ethereal Green Diamond, in Mumbai, India, and certified last year by the International Gemological Institute (IGI).

Shanghai Zhengshi Technology held the record before that, with a a 12.75-carat F/VVS2.

The GIA says that as demand for lab growns increases, records for crystal size and quality are frequently broken.

"The first CVD diamond I examined in 2003 was a 0.23 ct pear shape, with clear brown color," said Dr. Wuyi Wang, GIA vice president of research and development, who examined the new record-sized CVD diamond.

"This 16.41 ct 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."

Chemical vapor deposition (CVD) is a newer method of producing lab-grown diamonds. It does not require high pressures like the longer-established HPHT (high pressure, high temperature) process.

Superhard Material of China

Superhard Material of China

Abrasives and Grinding Products of China

Abrasives and Grinding Products of China

Coated Abrasives of China

Coated Abrasives of China

Chia International Abrasives & Grinding Exposition

China International Abrasives & Grinding Exposition

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