One of the largest and rarest diamonds on the planet is set to be auctioned off next month. The 555.55 carat black diamond – known as ‘The Enigma’ – set the Guinness World Record as the largest cut diamond in 2006. It’s believed to have arrived on Earth from outer space via a meteorite. The diamond is heading to London in February, where it will be sold by the world-famous Sotheby’s auction house. It’s expected to fetch somewhere in the ballpark of $6.8 million – and in case you’re wondering, Sotheby’s says it will accept crypto as payment. How much do you think it will sell for?