The Enigma: Mysterious black diamond up for auction - BBC News

The mysterious gem, known as The Enigma, is believed to be the largest cut diamond on Earth.

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Black diamond : a price equal to the mystery of its origin, Black Diamond

BBC Documentaries

Mystery black diamond, 'The Enigma', expected to fetch over $4 mn at California auction - The Economic Times

The Luxury Diamond Company

Huge Black Diamond Sold for $4.3 Million–and No One Knows Where it Came From or How it Was Formed

The Enigma: Mysterious black diamond up for auction - BBC News

Enigma Black Diamond Sells For $4.3 Million At Auction

Shocking footage shows walker being rescued from edge of a cliff