People watch the ornamental stones and jade during the 9th Xinjiang International Ornamental Stone Hetian Jade Fine Collection Expo in Xinjiang International Convention and Exhibition Center in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, June 17, 2016. The event started on Friday and will last till June 28, attracting more than 1,600 exhibitors with thousands of displayed items. Photo: Xinhua

People watch the ornamental stones and jade during the 9th Xinjiang International Ornamental Stone Hetian Jade Fine Collection Expo in Xinjiang International Convention and Exhibition Center in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, June 17, 2016. The event started on Friday and will last till June 28, attracting more than 1,600 exhibitors with thousands of displayed items. Photo: Xinhua

An exhibitor arranges the ornamental stones and jade during the 9th Xinjiang International Ornamental Stone Hetian Jade Fine Collection Expo in Xinjiang International Convention and Exhibition Center in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, June 17, 2016. The event started on Friday and will last till June 28, attracting more than 1,600 exhibitors with thousands of displayed items. Photo: Xinhua

People take photos of models wearing ornamental stones and jade during the 9th Xinjiang International Ornamental Stone Hetian Jade Fine Collection Expo in Xinjiang International Convention and Exhibition Center in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, June 17, 2016. The event started on Friday and will last till June 28, attracting more than 1,600 exhibitors with thousands of displayed items. Photo: Xinhua

People select the ornamental stones and jade during the 9th Xinjiang International Ornamental Stone Hetian Jade Fine Collection Expo in Xinjiang International Convention and Exhibition Center in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, June 17, 2016. The event started on Friday and will last till June 28, attracting more than 1,600 exhibitors with thousands of displayed items. Photo: Xinhua

People watch a "feast of stones" during the 9th Xinjiang International Ornamental Stone Hetian Jade Fine Collection Expo in Xinjiang International Convention and Exhibition Center in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, June 17, 2016. The event started on Friday and will last till June 28, attracting more than 1,600 exhibitors with thousands of displayed items. Photo: Xinhua

People touch the ornamental stones and jade during the 9th Xinjiang International Ornamental Stone Hetian Jade Fine Collection Expo in Xinjiang International Convention and Exhibition Center in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, June 17, 2016. The event started on Friday and will last till June 28, attracting more than 1,600 exhibitors with thousands of displayed items. Photo: Xinhua

People watch ornamental stones during the 9th Xinjiang International Ornamental Stone Hetian Jade Fine Collection Expo in Xinjiang International Convention and Exhibition Center in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, June 17, 2016. The event started on Friday and will last till June 28, attracting more than 1,600 exhibitors with thousands of displayed items. Photo: Xinhua

People take photos in front of ornamental stones during the 9th Xinjiang International Ornamental Stone Hetian Jade Fine Collection Expo in Xinjiang International Convention and Exhibition Center in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, June 17, 2016. The event started on Friday and will last till June 28, attracting more than 1,600 exhibitors with thousands of displayed items. Photo: Xinhua