A model presents a 6.01-cart Cushion-shaped Fancy Vivid Blue Diamond and Pink Diamond Ring (top) with the estimated value of 70 to 85 million HK dollars (9 to 11 million U.S. dollars) and Golconda Pink (bottom), a rare 9.27 carat Golconda Fancy Vivid Pink Diamond and Diamond Ring with the estimated value of 100 to 150 million HK dollars (13 to 19 million U.S. dollars) during a media preview of Sotheby's in Hong Kong, south China, Sept. 22, 2011. Sotheby's Hong Kong will hold its Magnificent Jewels and Jadeite Autumn Sale on Oct. 5 with a total of 359 lots with an estimated value of 660 million HK dollars (85 million U.S. dollars). (Xinhua/Song Zhenping)