GIA DIAMOND PROPORTION COMPARATOR TOOL

Description: THIS IS A MODEL 750 DIAMOND PROPORTION COMPARATOR, DESIGNED AND MANUFACTURED BY GEM INSTRUMENTS CORPORATION, A DIVISION OF THE GEMOLOGICAL INSTITUTE OF AMERICA. THIS INSTRUMENT IS NOT OFFERED BY GIA ANY LONGER, HOWEVER IT WAS THE BEST INSTRUCTIVE TOOL FOR SELLING IDEAL-CUT AND TRIPLE EXCELLENT GRADE DIAMONDS. IT UTILIZES A SLIDE BAR CONTAINING THREE (3) TRANSLUCENT DIAMOND SHAPE CHIPS REPRESENTING POSSIBLE PROFILE DEPTHS OF A DIAMOND (PICTURE A WITH NO OVERHEAD LIGHT TURNED ON). SLIDING THE CHIPS ALONG THE CHANNEL, UNDER THE OVERHEAD LIGHT SOURCE AS SHOWN IN B, C & D, WILL ILLUSTRATE HOW A DIAMOND'S CUT AFFECTS ITS BRILLIANCE AND DESCRIBED AS FOLLOWS: PICTURE B - THE IDEAL CUT DIAMOND (or GIA TRIPLE EXCELLENT) ABSORBS ALL OF THE LIGHT THAT ENTERS THE CROWN AND REFLECTS IT ALL BACK OUT OF THE CROWN AS MAXIMUM BRILLIANCE.PICTURE C - THE SHALLOW CUT DIAMOND ABSORBS THAT LIGHT AND LEAKS A HIGH PERCENTAGE OF IT OUT OF THE PAVILION, REDUCING ITS BRILLIANCE.PICTURE D - THE DEEP CUT DIAMOND ALSO LOOSES A HIGH PERCENTAGE OF LIGHT THAT IS TAKEN IN, BY IT LEAKING OUT THE SIDES OF THE PAVILION, WHICH ALSO REDUCES ITS BRILLIANCE.

Price: 450 USD

Location: Charlotte, North Carolina

End Time: 2024-11-18T20:35:16.000Z

Shipping Cost: N/A USD