Massive 706-carat diamond unearthed in Sierra Leone
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The diamond discovered in Botswana was named Lesedi La Rona, meaning "Our Light" in the local Tswana language. It's surpassed in size only by the 3,106-carat "Cullinan Diamond" found in 1905 in South Africa. A cut of that diamond, known as the "First Star of Africa," now is part of British royal family's crown jewels.