The Enigma — a 555-carat black gem and the largest diamond ever auctioned — can be purchased with cryptocurrency

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 the largest cut diamond in the world. It is to be part of a special sale that will allow bids in …