You are currently viewing IGI Hong Kong certifies largest CVD grown diamond to date

IGI Hong Kong certifies largest CVD grown diamond to date

Following a similar benchmark set three months ago, IGI Hong Kong recently certified the largest laboratory-grown diamond received to date.

With a finished weight of 12.75 carats, this collection-quality man-made gemstone was fashioned from a staggering 46.20 carat CVD-grown rough crystal. The creator, Shanghai Zhengshi Technology Co. Ltd., says it is the largest CVD laboratory-grown diamond ever produced.

IGI gemologists confirmed that the 12.75-carat stone was Type IIa, giving it exceptional chemical purity and transparency, with VVS2 clarity, F color, and triple-excellent marks in cut-quality and finish.

Following detailed scientific analysis, the laboratory confirmed that the stone had not undergone any post-growth treatments, so it can be categorized as a truly pure CVD diamond.

Bob Van Es, managing director of IGI Hong Kong commented:

A laboratory grown diamond of this carat weight, with such a high clarity and color grade is a remarkable achievement in the area of CVD cultivated diamond technology. As the industry leader in the certification of laboratory grown diamonds, IGI will continue to follow these new developments closely.


The global authority in diamond, gemstone and jewelry grading.

This Post Has One Comment

Leave a Reply