Gem Nation -- Glossary of Diamond, Jewelry and Watch Terminology 
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  GIA
The Gemological Institute of America (GIA) is one of the most well respected institutions for gemological research and learning. The GIA Gem Laboratory is a highly respected lab that provides detailed credentials on every diamond for which it produces a report.
   
  Girdle
The narrow rim around the diamond separating the crown and pavilion. The girdle is parallel to the table and is the largest diameter of any part of the stone.
   
  Gold
The oldest precious metal known to man. See also White Gold and Yellow Gold.
   
 

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