<http://schema.org/description>
"Australia\u2019s national gemstone, the opal, has been chosen as the feature gemstone of China\u2019s first top-level international mineral and gem exposition, the state-approved China (Changsha) Mine"^^<http://www.w3.org/2001/XMLSchema#string>
<http://au.blouinartinfo.com/news/story/886727/chinas-first-major-gem-show-to-feature-the-australian-opal>