by Elaine Yu HONG KONG, China (AFP) — A giant diamond named the “Pink Star” broke the world record for a gemstone sold at auction when it fetched $71.2 million in Hong Kong on Tuesday. The 59.60-carat “Pink Star,” the largest in its class ever graded by the Gemological Institute of America, was sold to the city’s Chow Tai Fook jewellery chain. “Sotheby’s Hong Kong is very proud to have this record,” its Asia chairman […]