Diamond Testers

Diamond Wizard Multi-TesterDiamond Wizard Multi-Tester
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Product Manual (.pdf)
Diamond Pro Multi-testerDiamond Pro Multitester
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Product Manual (.pdf)

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


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.  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 type of gemstone has its own characteristic rate for conducting heat.

A diamond multi-tester distinguishes diamonds from all other minerals including moissanite

A multi-tester combines the heat conductivity test of a diamond tester with the electrical conductivity test of a moissanite tester in a single test instrument.

Since most diamond multi-testers work this way, how do you shop for a diamond tester? One critical feature to look for is whether the multi-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 locations, 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.

You are going to want a multi-tester with a retracting tip.  The reason is that the spring loaded tip assists you to apply just the right amount of pressure without damaging the tip, avoiding damage and downtime for repairs.

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 combination diamond/moissanite testers made by Tri-Electronics, based in San Diego, California.   They have ALL of the features noted above, great factory warranties and EXCELLENT service. 

As a basic diamond tester, we favor the Diamond Pro. The Diamond Pro utilizes a proven thermal conductivity testing method to instantly verify that the stone is not a simulant. At the same time, the Diamond Pro applies an electrical conductivity test for moissanite.  The test results are indicated by distinctive visual lights and audible beeps, one each for Moissanite, Simulant, Metal and Diamond.  An A/C power adaptor is optional.  Comes with AAA alkaline batteries.

High intensity light enhances the detection of moissanite with a multitester applying an electrical conductivity test.  The Diamond Wizard features a high intensity light illuminating the diamond that you are testing.  Though it comes with 3 AAA alkaline batteries, it accepts 3 AAA NimH Batteries which are rechargeable.  An A/C power adaptor is optional.  The Diamond Wizard has all the other features of the Diamond Pro.  Both are covered by a 3 year factory warranty.  Warranty service takes place reliably in San Diego, California.


Description Price Quantity
Diamond Pro Diamond/Mossanite Tester with
3 Year factory Warranty
by Tri-Electronics
MSRP $249.00
Diamond Wizard Diamond/Mossanite Tester with
3 Year factory Warranty
by Tri-Electronics
Accepts rechargable batteries and features a light
MSRP $279.00