A man visits the Vancouver Gem and Mineral Show in Vancouver, Canada, March 24, 2017. (Xinhua/Liang Sen)
![CANADA-VANCOUVER-EXHIBITION-GEM-MINERAL](http://news.xinhuanet.com/english/photo/2017-03/25/136156772_14904062704991n.jpg)
People visit the Vancouver Gem and Mineral Show in Vancouver, Canada, March 24, 2017. (Xinhua/Liang Sen)
![CANADA-VANCOUVER-EXHIBITION-GEM-MINERAL](http://news.xinhuanet.com/english/photo/2017-03/25/136156772_14904062705441n.jpg)
A man takes a closer look to a piece of blue sapphire during the Vancouver Gem and Mineral Show in Vancouver, Canada, March 24, 2017. (Xinhua/Liang Sen)