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This huge black diamond just sold for $4.3 million. No one knows where it came from.

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Geologists still can't say for sure whether the enormous stone called the Enigma crystallized in Earth’s mantle or fell from outer space.

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Black 555.55-carat diamond dubbed 'The Enigma' sells for £3.1 million at auction

Black diamond, largest ever cut, sells for £3.2 million

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Black 555.55-carat diamond dubbed 'The Enigma' sells for £3.1 million at auction

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