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GIA Grades Largest HPHT Synthetic Diamond to Date

Feb 25, 2016 6:37 AM   By Rapaport News
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RAPAPORT... The Gemological Institute of America (GIA) announced it graded the largest faceted blue synthetic diamond ever examined by the organization.

Researchers in the GIA’s New York laboratory inspected the emerald-cut, 5.03-carat HPHT-grown type-IIb stone produced by New Diamond Technology (NDT), a company based in St. Petersburg, Russia, and one of the founding members of the recently launched International Grown Diamond Association. The gem was graded as fancy deep blue, according to a lab note February 19. The examination took place in January.

“As the size and quality of synthetic diamonds improve, careful identification is essential,” the note said. “Examination of this large IIb synthetic diamond, combined with those previous reported from NDT, illustrates the rapid progress in HPHT growth technologies. This is a development that will eventually impact the jewelry industry.”

Several distinctive features of HPHT-grown diamonds were identified, including faint but sharp color zoning and a cuboctahedral growth pattern. The examination also found two broad bands which have been reported previously in NDT’s type-IIa and IIb HPHT diamonds.

The largest faceted colorless HPHT-grown diamond reported to date was a 10.02-carat, E, VS1 stone reported by IGI Hong Kong in 2015, the lab note added.
Tags: Gemological Institute of America, GIA, HPHT, International Grown Diamond Association, lab-grown diamonds, NDT, New Diamond Technology, Rapaport News, Synthetics
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