StillCoolDiamond Tester, High Accuracy Diamond Tester Pen, Diamond Tester Professional, Diamond Detector Gem Tester Gemstone Gemstone Tester, Black

1 Don't believe reviews that say this item does not work. It works perfect for me.2 Tested Diamond, Moissanite, Ruby, Tanzanite, Topaz, London Blue Topaz and Cubic Zirconia. All the readings were perfect.3 Set at 4. Diamond and Mossanite blew red, other precious stones 6 or 7. Cubic Zirconia did not move.4 I don’t have an expensive machine to compare this to, but for me it identified all the stones I tried it on.5 Make sure your fingers are on the metal plate.6 IMPORTANT Diamond ( hardness 10) and Moissanite ( Hardness 9.5) tested the same. So don’t use this to validate authenticity.7 Yes, I recommend it and would purchase it again.

As per advertise

I liked that it did let me separate my wife's jewelry stash into diamond and not diamond piles. She passed away a year ago without us ever going over her jewelry so that I would what was what. The device is a little awkward to use since you must be touching the jewelry with one hand and holding the tool in the other. If you are going to test small diamonds in their settings I suggest you use a loupe so you can more easily get the probe onto the stone itself. Since you are measuring heat transfer you really must have the probe perpendicular to the diamond to insure the heat is properly transferring. And, you must insure the stones are clean since a film of dirt and oil can impede the heat transfer and lead to an incorrect reading.

i have had five diferent kind of diamond testers ALL of them work great if you use them correctly there not hard to use but people dont read how to use them its not" rocket surgery"

This us cheap and a waste of money . The battery cover is hard to open and once battery is in its hard to take out and put back in . That struggle alone is enough but it is also cheaply made with plastic .