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

Geologists still can't say for sure whether the enormous stone called the Enigma crystallized in Earth’s mantle or fell from outer space.

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

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

Rare diamond, blasted from outer space, could fetch $6.8M

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

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

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Minerals and Gems National Geographic

Two Back-to-Back Contemporary Auctions at Sotheby's London Send Mixed Signals About the Art Market

Enigma Black Diamond Sells For $4.3 Million At Auction

California woman finds 4-carat diamond at Arkansas' Crater of Diamonds