Electronic Diamond Color Grader Stirs Debate

A new debate over diamond color grading is shaping up, and it's a battle of man vs. machine. The machine is an electronic grader called the Gran Colorimeter. An Israeli manufacturer introduced the instrument 11/2 years ago, but it's only now making an impact, thanks to a new full-fledged marketing program to retailers and the diamond trade. The Colorimeter works like this: the user places a diamond on a small pedestal in the instrument. A light beam is directed through the stone and a series of filters. A receptor then analyzes the beam and measures the absorption of various colors. Results are shown in a Gemological Institute of America color scale reading. The $6,750 instrument is distributed through GIA Gem Instruments, Kassoy Inc. and Gesswein Co. Proponents say the Colorimeter can help retailers who may not have diamond grading facilities or expertise of their own and those wh
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