WEBSTER, F.G.A. Robert <br/><br/>
Practical gemmology; a study of the identification of gem-stones, pearls,and orn 

 - 5th ed. 
 - London  N.A.G.press  1973 
 - 209 p. 
<br/><br/><label>ISBN: </label>31622 
<br/><br/><label>Dewey Class. No.: </label>553.8  / WEB