A model holds up the 1109-carat 'Lesedi la Rona' diamond, reportedly the largest gem-quality rough diamond to be discovered in over 100 years, during an auction preview at Sotheby's auction house in New York, U.S. on May 4, 2016. The diamond, which was discovered in November 2015 in Botswana, will be auctioned on 29 June 2016 by Sotheby's in London and is expected to sell for over 70 million USD. (Photo/Agencies)
