A model presents a 24.7 carat ruby and diamond ring, which is expected to fetch up to 92 million HK dollars (around 11.7 million U.S. dollars) in Hong Kong, south China, March 20, 2018. Sotheby's Hong Kong Chinese Works of Art Spring Sale Series 2018 will take place on April 3 at the Hong Kong Convention and Exhibition Centre. The series of sales will offer about 300 items with a total estimate of nearly 730 million HK dollars (94.9 million U.S. dollars).(Xinhua/Lui Siu Wai)