World's second-largest diamond 'too big' to sell

The world's second-largest diamond ever found, unearthed by Canada's Lucara Diamond (TSX:LUC) in Botswana two years ago, will have to be cut after it failed to sell at a Sotheby's auction last summer. Bidding for the now historic 1,109-carat “Lesedi La Rona,” which means “our...