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The 1109-carat rough Lesedi La Rona diamond, the biggest rough diamond discovered in more than a century, sits in a display case at Sotheby's. The stone was found by Lucara Diamond Corp. last year at its Karowe mine in Botswana. The diamond, which is nearly the size of a tennis ball at 66.4 x 55 x 42mm and is believed to be about 2.5 billion to 3 billion years old, was named "Our Light" in the local Tswana language. Lesedi La Rona will be offered at auction in London on June 29 and be on display at Sotheby's New York. The diamond could sell for $70 million or more. (Getty)