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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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