Russian lab-grown diamond manufacturer New Diamond Technology says it has grown a 5.11 ct. K SI diamond, which it bills as the largest man-made polished near-colorless stone ever produced.
The manufacturer says the unenhanced radiant-cut type IIa diamond, produced by the high-pressure high-temperature (HPHT) method, bears a K SI grade but it has not yet been sent to a lab, according to company president Tamazi Khikhinashvili.
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