Webster, Robert <br/><br/>
Gems :  their sources, descriptions and identification / 
Robert Webster 
 - 2nd ed., revised impression 
 - London :  Butterworths,  1972 
 - xvi, 838  p., 23 leaves. :  ill., (some col.), maps.  ;  26 cm. 
<br/><br/>Bibliography : p. 780-783 
<br/><br/><label>ISBN: </label>0408206535 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Precious stones<br/>Jewelry