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    • A 555.55-carat black diamond believed to come from space is going on sale

    The extremely rare 555.55-carat 'Enigma' black diamond. (Source: Sotheby's) The extremely rare 555.55-carat 'Enigma' black diamond. (Source: Sotheby's)
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    A 555.55-carat black diamond that is truly from out of this world was sold for £3.16 million (US$4.28M) after fees at Sotheby's.

    The rare gem, which Sotheby's has dubbed "The Enigma," is believed to have come from outer space -- either created from a meteoric impact or from a "diamond-bearing" asteroid that collided with Earth.

    A natural faceted black diamond of this size is an "extremely rare occurrence," according to Sotheby's, which expected it to sell for as much as £5 million (US$6.8 million) when it went under the hammer in February in London, after being exhibited in Dubai and Los Angeles.

    Black diamonds, also known as Carbonado diamonds, can be dated to between 2.6 to 3.8 billion years ago and have trace amounts of nitrogen and hydrogen -- elements found in interstellar space. They also contain osbornite, a mineral present in meteorites.

    Nikita Binani, a jewelry specialist at Sotheby's in London, called the diamond "a true natural phenomenon."

    "Its sale represents a once-in-a-lifetime opportunity to acquire one of the rarest, billion-year-old cosmic wonders known to humankind," she said in press release Monday.

    The shape of the diamond is inspired by the Middle Eastern palm symbol of the Hamsa, a sign of protection, which means five in Arabic. The theme of five runs throughout the stone, according to the auctioneer. In addition to its 555.55 carats, it also contains exactly 55 facets, or faces.

    Black diamonds that are faceted have sold in the past at prices surpassing £10,000 ($13,600) per carat, Sotheby's told CNN.

    The diamond was open for bidding online from February 3 to 9, and the auction house said it would accept cryptocurrency as payment.

    The move follows the sale of a 101-carrat diamond, dubbed which became the most expensive jewel ever purchased with cryptoccurency when it sold last year, according to Sotheby's.

    The pear-shaped gemstone sold for the equivalent of $12.3 million, after the auctioneer announced it was accepting offers in bitcoin and ethereum, in addition to traditional forms of payment. Sotheby's would not disclose which of the two cryptocurrencies had been used to make the purchase.

    A number of auction houses have begun welcoming cryptocurrencies for big-ticket items, which have included paintings and NFTs -- the blockchain-backed tokens increasingly used to transfer ownership of digital artworks and collectibles. Sotheby's CEO Charles Stewart told last April that he believed NFTs and crypto were opening up the art market.

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