A member of Sotheby’s staff poses holding a 26.27 carat, cushion-shaped, white diamond, for sale at Sotheby’s auction house in London on May 22, 2017.
The large diamond is expected to fetch around 350,000 GBP (405,000 euro; 456,000 USD) at auction 30 years after its owner paid 10 GBP for it at a car boot sale, thinking it was a costume jewel. / AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)