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313ct. Diamond Emerges as World’s Largest D-Color

Sep 26, 2019 5:13 AM   By Avi Krawitz
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Nemesis International on Thursday unveiled a 313-carat diamond that has been certified as the largest D-color polished stone in history. 

The emerald-shape, VVS-clarity diamond, known as Constellation 1, is one of eight stones that make up a collection manufactured from the 813-carat Constellation rough, which Nemesis bought in partnership with Swiss jeweler de Grisogono for $63.1 million in 2016. At $77,613 per carat, the stone still ranks as the most expensive rough diamond ever sold.

Tom Moses, executive vice president and chief laboratory and research officer at the Gemological Institute of America (GIA), confirmed with Rapaport News that the stone was the largest graded D-color diamond on record. 

However, Nemesis has no immediate plans to sell the diamonds, CEO Konema Mwenenge told Rapaport News on the sidelines of the Dubai Diamond Conference. “We want to showcase this as the work of art that it is,” he stressed. “Diamonds are not just a commodity and this stone is impossible to value. We’re focused on building its legacy.”

The company is considering a roadshow to display the collection around the world at museums and other platforms. “We want to keep them as a family from the same rough,” Mwenenge added. The eight stones vary in size and shape, and range in clarity from flawless to internally flawless and VVS. The second-largest stone in the family is a 102-carat diamond. 

The diamonds will also be presented in their full polished form for now, but will eventually be mounted into jewelry. That contrasts with the company’s last major project, the Art of de Grisogono, an emerald-cut, 163-carat, D-flawless diamond, cut and polished in New York from a 404-carat rough diamond. That piece was sold as a necklace that could also transform into a bracelet, fetching $33.7 million at a Christie’s auction.

D for Dubai

The evaluation, mapping and polishing process of the Constellation collection took over 18 months to complete, with the main processing carried out by Almas Diamond Services, a sister company of Nemesis International, based in the Dubai Multi Commodities Centre’s Almas Towers. The company achieved a 57% recovery rate, Mwenenge noted, indicating the weight of the final polished relative to the rough.

Mwenenge stressed that Dubai was central to the Constellation’s journey. Nemesis used the Dubai Diamond Conference as a platform to unveil the Constellation rough two years ago, and chose this year’s event venue to reveal the polished.

“We want to promote this as a joint success with Dubai,” Mwenenge said. “Who would have thought five years ago that the largest D-color diamond in history would have been produced in Dubai?”

Image: The 313-carat polished diamond. (Nemesis International)

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Tags: Avi Krawitz, Constellation, De Grisigono, diamonds, DMCC, Dubai Diamond Conference, Nemesis, Rapaport News
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