De, Silva R.N.P. <br/><br/>
Gemmology a practical approach 

 - Ratmalana :  Vishva Lekha,  2002. 
 - xiv,165p.;  21cm 
<br/><br/><label>ISBN: </label>955-97829-0-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth Sciences
<br/><br/><label>Dewey Class. No.: </label>553.8  / DES