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World's largest black diamond to go under hammer in UK

The world's largest cut diamond went under hammer at the UK's famous auction house Sotheby's on Thursday.

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"Today we are extremely excited to present The Enigma, a truly rare fancy black carbonado diamond weighing a staggering 555.55 carats with precisely 55 facets, a technical feat for one of the toughest diamonds in existence," said Nikita Binani, Sotheby's jewelry specialist.