The Gemmological Association of Australia has published this A2 size poster to assist your recognition and correct description of Australia's National Gemstone - opal. By displaying this attractive educational poster in your premises, you will enhance your professionalism and status within the gem and jewellery industry. For gemmologists, this poster will serve as an essential reference on the correct description of opal. Students of gemmology will find this poster to be a very precise, unique source of essential gemmological knowledge. Those gem merchants and jewellers who display this poster prominently in their place of business will be performing an essential educational service for their customers.

For all lovers of opal this poster will serve as a constant reminder of the beauty and variety that makes opal such a desired gemstone.