A white jade Yubi seal from the Qianlong period inscribed with the characters "Taishanghuangdi", or "Overlord Emperor", is shown at a Sotheby's preview in Hong Kong March 9, 2010. The seal is expected to fetch in excess of $6.3 million at an auction on April 8, 2010. REUTERS/Bobby Yip (CHINA - Tags: SOCIETY)