Workers polish the base of gem ornaments in Ruili City, Dai-Jingpo Autonomous Prefecture of Dehong, southwest China's Yunnan Province, May 26, 2011. Since the 1990s, Ruili has dedicated itself to developing the jewelry industry. There are over 6000 shops and 40,000 professionals engaged in jewelry industry in Ruili, with the annual trading volume reaching 2 billion RMB yuan. [Xinhua/Lin Yiguang]