Diamond the size of a tennis ball could fetch $70 million

A Sotherby's employee holds Lesedi La Rona Diamond on May Tuesday 3, 2016 in New York City. The diamond the size of a tennis ball that is the largest discovered in more than a century could sell at auction for more than $70 million. Sotheby's says it will offer the Lesedi la Rona diamond in London on June 29. (Donald Bowers/Getty Images for Sotheby's, via AP)

LONDON (AP) — It’s a rock for the ages.

A 3-billion-year-old diamond the size of a tennis ball — the largest discovered in over a century — could sell for more than $70 million, auctioneer Sotheby’s said Wednesday.

The auction house plans to offer the Lesedi la Rona diamond in London on June 29.

The auctioneer said the rough gemstone “of exceptional transparency” could yield the largest top-quality diamond ever cut and polished.The diamond was unearthed in November in Botswana at a mine owned by Canada’s Lucara Diamond Corporation. It measured 1,109 carats, the second-largest gem-quality rough diamond ever discovered. Its name means “our light” in the Tswana language of southern Africa.

David Bennett, chairman of Sotheby’s jewelry division, called the discovery “the find of a lifetime” and the auction unprecedented.

“Not only is the rough superlative in size and quality, but no rough even remotely of this scale has ever been offered before at public auction,” he said.

The largest diamond ever found was the 3,106-carat Cullinan diamond, unearthed in South Africa in 1905. It was cut into nine pieces that form part of the U.K. Crown Jewels.

The Lesedi la Rona could smash the record price for a diamond of $48.5 million, paid at a Geneva sale last year for the 12.03-carat polished “Blue Moon” diamond. Hong Kong billionaire Joseph Lau picked it up as a gift for his 7-year-old daughter.

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