“I’VE seen grown men with tears in their eyes” in front of it, an auctioneer from Sotheby’s said as he opened bidding on June 29th on the 1,109-carat Lesedi La Rona, the biggest diamond to be discovered in over a century. Within minutes the tears were, if anything, of embarrassment. Bidding, which started at $50m, was desultory. A rough stone that Sotheby’s had put in the same league as the 3,107-carat Cullinan diamond, discovered in South Africa in 1905, failed to make its $70m reserve. “I’m a bit disappointed. There were no private buyers and the diamantaires stayed away,” said Lukas Lundin, chairman of Lucara Diamond, a Canadian firm that unearthed the stone in Botswana last year.