HMJOYDiamond Tester, Hight Accuracy Jewelry Diamond Tester + 40X Jewelers Loupe, Professional Diamond Selector for Novice and Expert Jewelry Diamond Tester Pen

I bought this because I was in the market for some diamond studs. Worked well on all my heirloom and costume jewelry, but my friends would rather stay in the dark with their own jewelry. I get it. 😆

Bought this to test out a recent online jewelry purchase. Used this device to test diamonds, cubic zirconia, precious stones, and glass. Each one was identified correctly. So glad I bought this!

I was so excited to own this one, dis covered that have a real diamonds for sure.

Didn't work. Asked for a replacement. Still did not work. Tried it on two known diamonds - nothing. Touched it to metal - nothing

This diamond tester is fantastic. It is extremely accurate, and easy to use. You can use it to test any size diamond, and you know immediately if you have a real diamond. It can be used to detect real gems as well. This tester has been an amazing help in cleaning out our old family property. The accuracy of the diamonds I have tested with this has been verified by taking it to a jeweler afterward, which is what you should always do. This tester is more of a quick read to decide if going to the jeweler is worth doing. But I have yet to have a jeweler disagree with the results given by this tester.

I have always wondered about a couple rings and was super happy to verify that they are real with this diamond tester. It is interesting to see how quickly it can separate diamonds, sapphires and glass. Definitely take a look at the instructions because I was incorrectly using it at first.

I decided to try this product out, because I found several diamonds in a parking lot. I was very disappointed to find out each diamond was fake. None made the diamond tester go up in color. Looking through the loupe I found air bubbles which of course would tell you the diamond is fake. The ones I found sparkled very brightly so I really thought I had something. With the tester and loupe I did find they weren't authentic. Sad, but happy at the same time. I was able to test every owned diamond. The ones I paid for registered as real. A great tool to have. Even has a small blue plate for loose diamonds. Well worth the purchase. 5 stars!

Bought this to ensure purchased diamonds are actually diamonds BUT per the enclosed instructions this cannot tell if a stone is diamond or moissanite. Disappointed that this will not be 100% helpful

Disappointed that battery with it was flat, didn’t know if machine wasn’t working or battery so couldn’t test it straightaway then I had to go buy a battery, new battery worked. So they provided a flat/faulty battery. Now I can test the machine

Machine didn’t work, every diamond had the same result as metals