Gems : their Sources, description and identification / 
Foreward : B.W. Anderson 
 - London ;  Boston :  Camelot Press Ltd.,  1975. 
 - 938 p. :  ill. ; text ;  24 cm. 
 - 739.2 +671.1 .
<br/><br/><label>ISBN: </label>0408705736 
<br/><br/><label>Universal Decimal Class. No.: </label>739.2 +671.1