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Geologists still can't say for sure whether the enormous stone called the Enigma crystallized in Earth’s mantle or fell from outer space.
Black 555.55-carat diamond dubbed 'The Enigma' sells for £3.1 million at auction
Black 555.55-carat diamond dubbed 'The Enigma' sells for £3.1 million at auction
The Enigma: Mysterious black diamond up for auction - BBC News
The Enigma: Billion-year-old black diamond sold for £3.16m
The 50 Most Expensive Cars in the World – Robb Report
The Diamond Market's Oversupply Challenge
National Geographic - Little is known about the history of the gem, which just sold to a new, anonymous owner for $4.3 million. But it stands as a brilliant and ancient reminder
Billion-Year-Old Black Diamond Sells for $4.3 Million - WSJ
A Look At JB Champion's Unique Observatory Chronometer Wristwatch: The OTHER Patek With A Chance To Become The Most Expensive Watch In The World - Hodinkee
Louis Vuitton just bought the world's second-biggest diamond
This huge black diamond just sold for $4.3 million. No one knows where it came from.
Two Back-to-Back Contemporary Auctions at Sotheby's London Send Mixed Signals About the Art Market