A Christie's employee (name withheld) holds a 101.73 carat pear-shaped diamond, the largest D colour flawless diamond ever to be offered for sale at auction, which is expected to fetch in excess of $20 million (£13.36 million), during a photocall at Christie's auction house, in central London, on March 13, 2013. (Photo by Dominic Lipinski/PA Wire)
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