Huge 'Enigma' diamond, possibly from space, to be sold at auction

Geological curiosity, also known as a carbonado, from billions of years ago is expected to fetch millions when it goes on sale at Sotheby's.

Thursday 27 January 2022 07:01, UK

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The exact origins of the 555.55 carat black diamond are not known; some think it could have come from space, while others theorise it is from deep below the planet's surface.
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