Rare 20-carat blue diamond unveiled in Botswana - ABC News

Blue diamonds are very rare, comprising only about 0.02% of mined diamonds.
A whopping 910-carat diamond was discovered in Southern Africa, one of the biggest gems ever found, the mining company that uncovered it said Monday.

Botswana unveils rare 20-carat blue diamond

Botswana unveils 'once-in-a-lifetime' blue diamond that could become the most expensive in the world

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Botswana unveils rare 20-carat blue diamond

World's Largest Blue Diamond With 15 Carats Sells For $57, 56% OFF

Botswana unveils rare 20-carat blue diamond