This huge black diamond just sold for £3.1 million. No one knows where it came from.

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The Enigma: 555.55 Carat Fancy Black Diamond

Japan's Giant Bluefin Tuna Sold $275,000 at Tokyo's Toyosu Fish Market Auction - Bloomberg

Diamond - Wikipedia

The Second-Biggest Diamond in History Has a New Owner - The New York Times

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The Enigma: Mysterious black diamond up for auction

Montblanc Solitaire Royal Black Diamond Ballpoint Pen 35784 4017941236937 - Fine Pens & Pencils - Jomashop

A 555-Carat Black Diamond Is Going Up for Auction. Did It Really Come From Space?

A 555-Carat Black Diamond Is Going Up for Auction. Did It Really Come From Space?

Jay-Z Earns First Diamond Certification

The Enigma.': Giant 555.55-carat black diamond heads to auction