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Out of This World: 555.55-carat Black Diamond Lands in Dubai

The 555.55 carat "The Enigma" black diamond.

The 555.55 carat "The Enigma" black diamond.

Photographer: Kamran Jebreili/AP Photo

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Dubai, United Arab Emirates (AP) -- Auction house Sotheby’s Dubai has unveiled a diamond that’s literally from out of this world.

Sotheby’s calls the 555.55-carat black diamond — believed to have come from outer space — “The Enigma.” The rare gem was shown off on Monday to journalists as part of a tour in Dubai and Los Angeles before it is due to be auctioned off in February in London.