A billion-year-old black diamond, believed to be the largest cut diamond on Earth, is going up for auction. There are competing theories about the origins of the gem, named The Enigma, including ...

A billion-year-old black diamond, believed to be the world's largest cut diamond, has sold for £3.16m ($4.3m). Named The Enigma, the 555.55 carat gem, which weighs about the same as a banana ...

But when it comes to the Enigma, a 555.55-carat Fancy Black Natural Colour diamond that went on sale with Sotheby’s earlier this month, that is a mystery. The prevailing theory is that it came ...

A black diamond weighing a staggering 555.55 carats is going up for auction at Sotheby's and living up to its name "The Enigma." Bidding opens on Feb. 3 at 6 a.m. PST (1400 GMT) and closes on Feb.

Sotheby's is auctioning off a 555.55-carat black diamond, and crypto enthusiasts can bid for it using cryptocurrency. Dubbed The Enigma, the gem was listed in the Guinness Book of World Records as ...

Last week at Sotheby’s Dubai, a 555.55 carat black diamond called “The Enigma” was unveiled and it will become the largest faceted diamond of any kind to appear at auction when it goes under ...