The 1109-carat ‘Lesedi La Rona’ is the biggest rough diamond unearthed in over a century and could fetch in excess of $70 million. It is being offered at a single lot auction by Sotheby’s in London on June 29 and bidding is expected to be frantic. The diamond, unearthed in Botswana in 2015 is the size … Continue reading World’s Biggest Rough Diamond Up for Auction in London