A method of coating the back of a stone with silver, gold, or colored foil. This enhances the brilliancy of the stone, by reflecting back as much light as possible. It is commonly seen in costume jewelry. A foilbacked rhinestone whose foil has been damaged (often from water creeping in) does not sparkle anymore and is said to be a 'dead' stone, low...
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http://www.indygem.com/pages/Glossary-of-Terms.html
A gemstone that has a thin metallic foil backing it to make it more reflective and enhance its sparkle
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http://www.saffronart.com/sitepages/jewelry/glossary.aspx
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