Telegraph reports that Sotheby’s auctioneers estimates a 3-billion year old diamond unearthed in November in Botswana, could sell for more than $70 million! The auction house plans to offer the Lesedi la Rona diamond in London on June 29. The tennis-ball sized diamond measured 1,109 carats, and is the second largest gem-quality rough diamond ever discovered. Its name means “our light” in the Tswana language of southern Africa. The auctioneer said the rough gemstone “of exceptional transparency” could yield the largest top-quality diamond ever cut and polished. David Bennett, chairman of Sotheby’s jewelry division, called the discovery “the find of a lifetime” and the auction unprecedented.

Info from Telegraph