Diamond Tester - Professional Jeweler Detector for Novice and Expert - Diamond Selector 2

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Diamond Tester - Professional Jeweler Detector for Novice and Expert - Diamond Selector 2

Do you like jewellery very much? But you are worried about how to identify the authenticity of jewellery.

This portable diamond tester is an electronic instrument designed and manufactured to identify true and false diamonds based on the thermal conductivity of diamonds. It can also be used to test sapphires, rubies, crystals, agates, and other gemstones.


This gemstone tester pen is a diamond tester as well as a multi-gemstone tester. It is intended to determine whether a gemstone is genuine or fake, such as a diamond, sapphire, crystal, ruby, agate, or jadeite. Diamond Selector is a professional diamond tester that is designed for quick, precise, and safe diamond testing.


The Diamond Tester Pen is easy to use and produces accurate results. 1. Insert a battery into the tester. 2. Remove the probe cap. 3. Turn on the light switch. 4. Ensure that only one light on the scale illuminates. 5. Check that the "ready lamp" light is turned on. 6th (If test a diamond, you then need to turn on the number of the light corresponding to the indoor temperature and diamond weight.)


If lights >= 9 and have sounds, it is a real diamond. If lights < 9 and no sounds, it is not diamond. If the light is 7 or 8, it is a true crystal. If the light is 6 or 7, it is true jade. If the light is 4 or 5, it is glass.


Color: Grey

Dimensions: 160*42*22mm

Testing Capability: Diamonds, Diamond simulation (e.g. CZ), Metal

Auto-Off: " N/A

Initial warm-up: ~ 20 sec.

Indicator: Audio and LED lamps

Power: 1 x 9V Battery ( not included)


1 x Diamond tester

1 x Testing platform

1 x Carrying case

1x User's manual

Customer Reviews

Based on 56 reviews
Eric Harris

I am glad this wasn't expensive. It worked immediately. I need it to decipher antique jewelry. Thanks!

Shawn Wilson

Works really good found some real diamonds that I thought was fake all and all good product

Anna Torres

I buy estate and vintage jewelry. Was happy to discover I had several pieces of jewelry with diamonds I would not of known otherwise. A great inexpensive tool.

Laura Carter

I love it because now I do have a a peace of tool that give me the opportunity to see if the stone that I have is a real diamond or not and that give me the opportunity to make my life a little bit mora happy and for the price it's just one of the best tool I had bought and that tool all ready had make my day by discovered that one peace of jewelry that I love very much it have real diamonds and that make my world very happy.

Kevin Thomas

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.