This is a pre-owned Presidium GIA Gem Diamond Jewel Tester. It works with batteries or electric.
Testing fluorescence in laboratory-grown diamonds with the
ARI by Presidium® Diamond Screener
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Diamond Screeners and Testers
Diamond Tester - Gemstone tester Latest Price, Manufacturers
Find many great new & used options and get the best deals for Used Presidium GIA Gem Diamond Jewel Tester With Manual~Working Condition at the best
Used Presidium GIA Gem Diamond Jewel Tester With Manual~Working Condition
How to Identify Gemstones (with Pictures) - wikiHow
The Gemological refractometer is considered by many to be the most important of all gem testing instruments. The primary use of the refractometer is
Gem Portable Refractometer, RHG181 1.30-1.81 Presidium Gemstone ldentification Tester for Jewelry, Gold & Silver and Diamond, Lab Refractometers