GEM TESTER-COLOR STONE
The Presidium Gem Tester / Color Stone Estimator provides a quick, easy, laboratory proven way to identify diamonds and separate and distinguish the most popular colored gem stones from one another. This valuable tool can eliminate human error when identifying precious gems. The Presidium Gem Testers accurate performance is based on the fact that different gem stones conduct heat at different rates. Simply touch the Gem Tester's sophisticated Thermoelectric Probe to the surface of any mounted or loose stone and the specially calibrated dial will show you the relative heat conductivity of the material.