Visitors select jewellery at the Sri Lanka booth in the Spring Jewellery Fair in Beijing, capital of China, March 27, 2014. The 2014 Spring Jewellery Fair kicked off at the Beijing Exhibition Center with more than 600 booths of about 200 exhibitors. (Xinhua/Zhang Yanhui)

A member of the National Gemstone Testing Center offer free test and consultation at the Spring Jewellery Fair in Beijing, capital of China, March 27, 2014. The 2014 Spring Jewellery Fair kicked off at the Beijing Exhibition Center with more than 600 booths of about 200 exhibitors. (Xinhua/Zhang Yanhui)