Hong Kong Jewellery and Gem Fair held

Opal stones, the national gemstone of Australia, are displayed during the Hong Kong Jewellery and Gem Fair in Hong Kong, south China, Sept. 19, 2011. (Xinhua/Chen Xiaowei)

Synthetic crystal items are displayed during the Hong Kong Jewellery and Gem Fair in Hong Kong, south China, Sept. 19, 2011. (Xinhua/Chen Xiaowei)

Crystal raw materials are displayed during the Hong Kong Jewellery and Gem Fair in Hong Kong, south China, Sept. 19, 2011. (Xinhua/Chen Xiaowei)

Rings with Chinese Character "he", which means harmonious, are displayed during the Hong Kong Jewellery and Gem Fair in Hong Kong, south China, Sept. 19, 2011. (Xinhua/Chen Xiaowei)

A visitor views jewellery at the Hong Kong Jewellery and Gem Fair in Hong Kong, south China, Sept. 19, 2011. (Xinhua/Chen Xiaowei)