Image credit: Shanghai Zhengshi Technology
A Chinese manufacturer, Shanghai Zhengshi Technology has produced the largest polished CVD lab-grown diamond weighing 12.75 carats. The stone had exceptional chemical purity and transparency, triple-excellent marks in cut-quality and finish, and no signs of any post-growth treatments.
The Type IIa diamond, graded as F colour and VVS2 clarity, and cut from a 46.20-carat rough CVD stone, was certified by IGI Hong Kong.
Bob Van Es, Managing Director of IGI Hong Kong said: “A laboratory-grown diamond of this carat weight, with such a high clarity and colour grade, is a remarkable achievement in the area of CVD cultivated diamond technology.”
Shanghai Zhengshi Technology claimed it was the largest CVD laboratory-grown diamond ever produced.
Aruna Gaitonde, Editor in Chief of the Asian Bureau, Rough&Polished
