MIUONO Diamond Tester, Professional Diamond Gem Tester Pen with 10x Magnifier and Tweezers for Novice and Expert (Battery Included)

PEOPLE PEOPLE PEOPLE: YOU MUST READ INSTRUCTIONS AND PROPERLY CALIBRATE AND IT WORKS PERFECTLY FINE. I'm seeing people say it doesn't work, can't tell difference between stones and moissanite and diamonds BUT IT'S PROBABLY BECAUSE THEY AREN'T PROPERLY CALIBRATING. AFTER PROPER CALIBRATION. (You have to read the instructions haha) All my diamonds and my moissanite tested as diamonds as they both should. My topaz did not register as diamond so that means IT WORKS properly.

It works

As described

Something it showed as being fake, but was actually real🤷🏻

Product is as described!

The unit works; however, I believe it was a return or a used one, the diamond tester was upside down in the carrying case that comes with it. Also, the tip that you place on a diamond has an individual little plastic/rubber slip on cover that was off, probably because the tip was sticking out of the carrying case. The case is simple and self-explanatory as it has a hard little section portioned off inside for the tip of the diamond tester to be placed inside while not in use. I should return the unit because the battery that came with it was "DEAD" it didn't have enough power to even turn the unit on. I had to buy a new 9V battery which cost me $7.00 and some change. I choose this particular unit because it came with a battery and then I end up having to buy one as I needed to use the unit, plus I wanted to make sure it was working. The diamond tester is easy to use, but because of the poor handling of the unit and the dead battery I can only give it 1 star.

Professional instrument to help with checking my jewelry and any other intended purchases.

If you are trying to distinguish between diamond and moissanite, then this won't work for you. Both my moissanite and diamond rings both set off the sound (and same color patterns). I also got a positive result for my sapphire ring. I'm not too shocked since sapphire and moissanite are at a 9 and 9.25 on the Mohr hardness scale (diamond is at a 10). However, for my travel rings with CZ/simulated diamonds, there was no sound at all. I am planning on using this to verify that any jewelry I order from online is authentic, but I will also be inspecting the stones with my loupe.