The International Gemological Institute (IGI) of Hong Kong has certified what it believes is the world’s largest HPTP-grown colourless diamond.
The 10.02 carat Square Emerald Cut stone was fashioned from a record-breaking, 32.26-carat piece of man-made rough, grown by St. Petersburg-based New Diamond Technology LLC, in less than 300 hours.
The laboratory certified the Type IIa stone as VS1 clarity, E color, with a ‘Very Good-Excellent’ finish grade. The news follows just two months after IGI certified a 5-carat Radiant Brilliant and 4-carat Cushion Brilliant at its Hong Kong laboratory – grown by the same company – which were at the time believed to be the largest man-made diamonds in existence.
Marc Brauner, co-CEO for IGI Worldwide, said the latest 10-carat stone is “unique in all aspects”, and that the science and technology behind the processes synthesising this stone are “significantly more advanced” than other manmade diamonds currently on the market. IGI claims the stone’s large size, in combination with the very high colour and brilliance, “will ensure it a prominent place among the pioneers in the diamond industry”.
Tamazi Khikhinashvili, president of New Diamond Technology, said that the company plans to unveil the diamond during JCK Las Vegas 2015.