Ted Themelis <br/><br/>
The heat treatment of ruby and sapphire 

 - Gemlab, Florida  c1992 
 - 236p 
<br/><br/><label>ISBN: </label>0-9409-6510-0 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>Jewellery
<br/><br/><label>Dewey Class. No.: </label>736.25 The