1. 
   precious stone
   Term limited to diamonds, emeralds, rubies and sapphires; pearls are also usually included. Other gems tones are generally termed semiprecious. The value of precious stones depends on rarity, size and quality, and on workmanship, such as faceting.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   precious stone
   precious stone: see gem.
   Found op http://www.infoplease.com/ce6/sci/A0917732.html
   
   

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