Gem identification viewer

Abstract

A gem identifying device using filtered transmitted light for use in distinguishing type-I colorless diamonds from type II colorless diamonds, and natural diamonds and gems from synthetic or treated diamonds and gems.

What is claimed:  
     
         1 . A gemstone identifying apparatus comprising: 
 a) a light source;    b) a surface on which a gemstone may be placed for observation;    c) an iris diaphragm to restrict light from being transmitted around the edge of a gemstone to be examined;    d) a selective filter, chosen depending upon the spectra of the gemstone to be distinguished;    e) a viewing lens for viewing light to be passed through a gemstone and said filter.    
     
     
         2 . The gem identifying apparatus of  claim 1  wherein said filter is a band pass filter with a center of about 415 nm.  
     
     
         3 . A gem identifying apparatus comprising: 
 a) a light source;    b) a surface on which the gemstone may be placed for observation;    c) a selective filter, chosen depending on the light transmission spectra of the gemstone to be distinguished;    d) a viewing lens for viewing light to be passed through the gemstone and filter.    
     
     
         4 . The gem identifying apparatus of claim  6  wherein said filter is a band pass filter with a center of about 415 nm.