HONG KONG, China (Reuters) – The largest oval fancy vivid blue diamond ever to appear at an auction shattered Asia’s jewelry auction record in Hong Kong on Tuesday (April 5) evening. The internally flawless blue diamond, weighing at 10.10 carats, was sold to an anonymous phone bidder at US$31.8 million at Sotheby’s Spring Sales after a couple minutes of bidding. Before a 12 percent buyer’s premium was added, the diamond’s hammer price of US$28.38 […]