No buyer for world’s largest rough diamond

“Lesedi la Rona”, the world's largest gem-quality rough diamond discovered in more than 100 years, fails to sell at auction in London.The 1,109-carat diamond, was uncovered last November in Botswana by Canadian mining company Lucara Diamond Corp, and had been expected to fetch more than $70 million (USD).The diamond drew a bid of $61 million at the Sotheby's auction in London, but fell short of the reserve price.The gem, whose name translates as “Our Light” in Botswana's Tswana language, is believed to be between 2.5 billion to more than three billion years old.