Mysterious 'Enigma' black diamond goes up for auction

A black diamond called 'The Enigma' is going up for auction at Sotheby's and weighs a staggering 555.55 carats.

Also known as a carbonado diamond, it is possible the mineral came from outer space.

There are only two places in the world that carbonados of this structure have been found: Brazil and Central African Republic, and it's believed the diamond was found in a mine in one of these countries.

It's expected to sell for between $4 million and $7 million.

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