The world’s largest cut diamond, thought to have come from outer space, has been sold by Sotheby’s for £3.2m. The billion-year-old, 555.55 carat black diamond entitled ‘the Enigma’, went under the hammer on the Sotheby’s online auction taking place from 3rd – 9th February. It didn’t achieve the stellar price expected, selling for £3.2m ($4.3m) on an estimate of $4m to $7m. Enigma, which possesses 55 facets, is designed in honour of the Middle Eastern...