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

A Bluefin Tuna Just Sold for $275,000 at Tokyo's Fish Market Auction – Robb Report

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

Diamond - Wikipedia

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

Billion-Year-Old Black Diamond 'The Enigma' Sells For More Than £3 Million

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

Billion-Year-Old Black Diamond Sells for $4.3 Million - WSJ

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

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

Billion-Year-Old Black Diamond 'The Enigma' Sells For More Than £3 Million

Billion-Year-Old Black Diamond 'The Enigma' Sells For More Than £3 Million

The Enigma: 555.55 Carat Fancy Black Diamond

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

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

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