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

The Enigma: Billion-year-old black diamond sold for £3.16m

Black Diamond, Washington - Wikipedia

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

Eye-wateringly expensive celeb engagement rings: Blake Lively's pink diamond, Rita Ora's emerald & more

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

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

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

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

Global Diamond Production +12% in 2021 – But Really Declining

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