Lenzen G <br/><br/>
Diamonds and diamond grading 

 - London  Butterworth           1983 
 - 258p.  cm. illus 
<br/><br/><label>Standard No.: </label>46500 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology
<br/><br/><label>Dewey Class. No.: </label>H191:8115, M3