Anderson, B. W. (Basil William),  1901- <br/><br/>
Gem testing / 
B. W. Anderson ; revised by E. A. Jobbins. 
 - 10th ed. 
 - London :  Butterworths,  1990. 
 - x, 390 p. :  ill. (some col.) ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0408060069 (hbk.) /  Hadiah 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Precious stones--Identification.<br/>Precious stones--Testing.