Hong Kong-based model and actress Lynn Xiong wears a 75.36 carats briolette diamond during a Christie's preview in Hong Kong May 7, 2013. The diamond, which is the largest D/1F briolette diamond on record and estimated to be worth between $8.5 million and $12.5 million, will be offered during Christie's Spring Auctions in May, according to a press release by Christie's.[Photo/Agencies]