Keller, Peter C.,  1947- <br/><br/>
Gemstones and their originis / 
(by) Peter C. Keller 
 - New York  :  Van Nostrand Reinhold,  1990 
 - 144 p. :  ill. ;  29 cm. 
<br/><br/>Include bibliographical references and index 
<br/><br/><label>ISBN: </label>0442319452 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Precious stones