Kraus, Edward Henry,  1875- <br/><br/>
Gems and gem materials / 
by Edward Henry Kraus and Chester Baker Slawson 
 - 5th ed. 
 - New York :  McGraw-Hill Book,  1947 
 - ix, 332 p. :  ill. ;  23 cm. 
<br/><br/>p. 317-319 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Precious stones