Diamond Testers

A diamond tester distinguishes diamonds from all other minerals except moissanite. 

diamond tester by Presidium

The DIAMONDMATE-A displays its results:

diamond tester display panel

Who needs a diamond tester? The science of gemology is about distinguishing one mineral from another by its physical properties.  How do you distinguish a diamond from a ruby or a sapphire or a topaz?.  Each may have a different hardness.  Each may refract light differently.  Each may have a different spectrum when viewed under a spectrometer.  You probably have not attended a gemology course, and you do not intend to shlep a refractometer or a spectrometer with you to a jewelry store or a gem show.  What you need is a portable, reliable and reasonably priced instrument that will tell you if you are looking at a diamond. 

A diamond tester distinguishes diamonds from all other minerals except moissanite.  After determining that your stone is probably a diamond by using a diamond tester, you test it if you need to be certain it is not a moissanite.  Learn about moissanite testing.

A diamond tester works by sending heat into the stone and measuring how fast the stone conducts the heat.   Each gemstone has its own rate for conducting heat.

Since most diamond testers work this way, how do you shop for a diamond tester?One critical feature to look for is whether the diamond tester will warn you if you are touching a metal prong instead of a gemstone.  This is important because a metal prong will register as diamond on most diamond testers that lack a metal warning.

If you will be using the diamond tester in multiple settings, you will want one that will test diamonds accurately across a range of different room temperatures.  After all, you are doing a thermal conductivity test.

If you are going to be testing diamonds in large numbers, you will want your diamond tester to warm up fast and to have little or no lag time between tests.

You may want to power the diamond tester with a convenient and replaceable battery, unfettered by a power cord.  Or, you may want to sit at your bench and bulk test gemstones one after the other, relying on AC power.  Your diamond tester should give you either option.

Finally, where is the factory that manufactured your diamond tester?  How long is your warranty and where do you get your warranty service done?

We feature diamond testers made by Presidum.   They have ALL of the features noted above, great factory warranties and EXCELLENT service.  As a basic diamond tester, we favor the Diamondmate-A by Presidium.  The PRESIDIUM DIAMONDMATE utilizes proven thermal conductivity testing method to instantly verify the authenticity of diamonds. The test results are indicated by visual light and audible beeps.

* No waiting time between tests.
* Pocket size.
* Low batteries indicator.
* Metal detector - intermittent beep.
* Measured diamond - continuous beep.
* Low battery consumption.
* Carrying case - standard for all models
* Size : L-160mm x W-21mm x H-30mm
* Weight : 45 gms
* Operates on AAA Alkaline Batteries (Not Included) or AC adaptor 120v / 230v (Order Separately)

Description Price
Presidium Diamondmate A