Webster, Robert <br/><br/>
Gems :  their sources, descriptions and identification / 
Robert Webster revised by B.W. Anderson 
 - 4th ed. 
 - London :  Butterworths,  1983 
 - 1006 p. :  ill. ;  25 cm. 
<br/><br/> Includes index  Previous ed.: London : Newnes-Butterworths, 1975 
<br/><br/><label>ISBN: </label>0408011483 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Precious stones