Categories Articles The Enigma — a 555-carat black gem and the largest diamond ever auctioned — can be purchased with cryptocurrency Post author By crystalg Post date January 18, 2022 Business Insider Business Insider Tags 'Black, 555carat, Auctioned, Cryptocurrency, Diamond, Enigma, ever, Largest, Purchased ← eBay Stock is Nearing a Bottom → Stuck on hold? Average person loses 26 days each year to wasted time