Instructions
Clean and dry the gemstone to be tested. This gem tester tests diamonds, but also tests sapphire, emerald, jadeite, ruby, topaz and spinel.
Plug the gem tester into a power source or use batteries if you prefer. This gem tester uses two AA alkaline batteries.
Remove the cap on the probe and make sure the tip is clean. Turn the instrument on and wait about 20 seconds for warmup.
Perform a practice test with the test disc for diamond or simulant on the tester, using the probe to push on the disc. The test disc is on the front of the tester and is used like a sample stone. Within 2 or 3 seconds, you should see the dial move to the area for the diamond or simulant.
Push the probe into the gemstone so that the probe wire tip retracts. When you test, it checks the heat conductivity and identifies the stone.
Watch the dial move. If it moves to the green area, the stone is a diamond. Readings in the red area are other gemstones, identified on the gem tester screen in the area of the dial. This gem tester can be used for loose or mounted stones of any type.