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Mystery diamond: black diamond, possibly from space, goes up for auction
A black diamond weighing a staggering 555.55 carats is going up for auction at Sotheby's and living up to its name 'The Enigma'.
A black diamond weighing a staggering 555.55 carats is going up for auction at Sotheby's and living up to its name 'The Enigma'.
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