This Summer, Sotheby’s will offer one of the earth’s rarest and greatest treasures - an exceptional 101.38-carat pear-shaped D Flawless diamond. Recently christened the ‘The Key 10138’, this is the second largest pear-shaped diamond ever to appear on the public market. In an unprecedented move, Sotheby’s will also accept cryptocurrency for The Key 10138, making it the most valuable physical item offered for purchase with cryptocurrency.