In this file photo, a Sotheby's employee displays a rare diamond dubbed "Blue Moon" during an auction preview. Hong Kong property tycoon Joseph Lau bought the 12.03-carat diamond for his daughter with a record 375 million HK dollars($48.39 million). Lau bought the gem at a Sotheby's auction and renamed it "The Blue Moon of Josephine" after his seven-year-old daughter. The sale came the day after he spent 28.5 million U.S. dollars on a rare 16.08-carat pink diamond, which he named "Sweet Josephine." (Photo/Agencies)
