The 10 Most Solid And Conductive Diamond Testers

Published on November 11, 2021

It makes sense to want only the best when you spend your hard-earned money on luxury items. For diamonds, this is especially true. 

If you splash out on what you believe is the most precious stone of them all, the last thing you want is to find out that it is actually moissanite (a diamond-like simulant made of silicon carbide). It is also possible to have inherited jewelry, made a lucky find or received a gift that you were unsure of its value.

​​Typically, jewelers have these handy diamond detectors as compact electronic devices. It is important to confirm the genuineness of diamonds using a jeweler diamond tester. It is a portable and handheld device designed to be carried around in your pocket like a pen.

You will often place a tiny needle-shaped tip on the stone in these devices. The clarity of the stone will be further clarified by a unique sound or visual cue.

Almost all testers operate based on the principles of thermal conductivity. The properties of heat conduction in various materials differ, and diamonds have unique heat conduction properties. In addition to thermal testing, some high accuracy testers also rely on electrical conductivity.


If you’re in a hurry, here are our top 3 quick picks for the best Diamond Testers of 2021


Criteria for Choosing the Best Diamond Testers

Diamond testers can be split into two types, but they both operate similarly.

Heat Diamond Testers

To determine the quality of a diamond, testers use heat to create thermal conductivity between the tip and the stone. Based on this data, the tester calculates the quality of the reading based on the speed at which heat passes through the diamond. Moissanite, a gemstone but not a diamond, cannot be detected using a heat tester.

Electric Diamond Testers

If you want the best and most reliable diamond tester, look for one that uses electricity. Testers like these perform the same function as heat testers but provide more accurate results. The price tag for these is higher than that of heat testers. Unlike diamond heat testers, they are able to detect moissanite.

Right now, Amazon has a variety of diamond testers to choose from. Our criteria for choosing the right ones are testers that come from a good brand and provide a good value for their price. We also chose testers that are easy to use and provide solid conductivity.


The 10 of Best Diamond Testers of 2021

Diamond Tester Pen

Diamonds can be distinguished from imitation stones using this portable electronic device. This device is used to identify diamonds quickly, accurately, and safely. The diamond tester tool kit is perfect for handling all diamonds and gems, as well as jewelry and precious metal items. When the lights are on, voice instructions emit audible sounds, allowing you to easily distinguish between masonry and stone. You can carry small portable electronic devices in your wallet or backpack, and they’re easy to use. The result can be obtained by pressing the switch with the tip perpendicular to the test masonry.

PROS
  • The tester is easy to use 
  • The price is worth its value
  • The tester is able to work with a lot of different diamonds

CONS
  • One customer reports that the tester doesn’t work with gemstones. 

HMKIS Diamond Tester Pen

Test diamonds quickly, precisely, and safely with this diamond selector tester. This tester pen is easy to use and easily explainable. For example, there will be no sounds or lights if the crystal is fake, like cubic zirconium (CZ), crystal, or glass. Built from durable ABS plastic, this 60X mini magnifier has two bright LED lights and a UV detecting light. Light from LEDs can improve visibility and can be used in dark environments, while UV lights can be used to spot fake currency notes. The device is equipped with a 9V lithium battery that can be recharged by USB and can be used 1000 times.

PROS
  • The tester is durable
  • The tester is easy to use
  • The tester provides an intuitive design

CONS
  • One customer reports that the light doesn’t turn on

MIUONO Diamond Tester

This is one of our personal favorite testers. It is a more sophisticated and precise diamond tester as it identifies whether a diamond is real or fake quickly. This diamond tester and magnifier come with convenient carrying cases. Designed to speed up, confirm, and ensure diamond quality, it uses non-destructive testing and is precise and fast. There will be at least nine LED lights on the pen, including a green indicator if the stone is a real diamond. 

PROS
  • The tester is easy to use
  • The tester provides fast results 
  • The tester provides a portable design

CONS
  • One customer reports that the tester they received defected

Diamond Tester and 60X LED Magnifying Glasses Jeweler Tool Kit Combo

Here is a combo that is totally worth your buck! With LED lights and an audio indication, the Yhkj Diamond Tester Pen is a great tool. During a test, the LEDs will light up when the diamond detector detects that the stone does indeed pass the tests. The Diamond Tester Pen will make a beep sound as well as show a row of fully lighted LEDs when it has completed all of its tests. In addition to the Yhkj Diamond Tester Pen and 60X LED Lighted Loupe, they both come with their own convenient carrying cases, as each item is small enough to fit into any purse or backpack. If you’re going to a garage sale, flea market, swap meet, etc., the Diamond Tester Pen and 60X LED Lighted Loupe combo is a must-have tool kit.

PROS
  • The tester is easy to use
  • The tester provides fast results
  • The tester provides an intuitive design

CONS
  • One customer reports that the tester stopped working after a few times

Gemoro Testerossa Diamond Tester

This particular tester may be a little more pricey than the others, but the value is miraculous. With its smooth ergonomic shape, the TESTEROSSA easily fits into your hand. The LED stone illumination further increases ease of use. TESTEROSSA is the best in its class thanks to its intuitive finger grip pads and fast warm-up time! This new enhanced metal identifies, detects, and separates diamonds from CZs, moissanite, and white sapphires. 

PROS
  • The tester is easy to use 
  • The tester provides different colors
  • The tester provides a miraculous design

CONS
  • One customer reports that the tester does not work with other gemstones

cultj Diamond Combo Tester

Designed to differentiate colorless diamonds and Moissanite, the Diamond Combo Tester is stable and accurate. With a bright display and sound detection, the results will be audible. Portable and ergonomic, a single test can distinguish colorless diamond, moissanite, and fake diamond based on differences in thermal conductivity and electronic conductivity. These tests can also distinguish low conductivity moissanite from colorless diamond. The probe is equipped with an alarm when it comes into contact with metal, as well as an alarm that sounds when the battery is low.

PROS
  • The tester is easy to use
  • The price is worth its value
  • The tester provides a solid design

CONS
  • There are no cons reported for this tester

Yult Professional Diamond Tester

Designed to perform diamond testing quickly, accurately, and safely, this portable electronic device is used to distinguish real diamonds from imitation stones. This tester is portable and equipped with a carrying case. One can use it very easily, as false diamonds won’t display and won’t make a sound. Meanwhile, it will have a light-up indicator if it is a real diamond. Due to the high-quality ball bearings, the rope won’t twist, tangle or bend like other fitness ropes, so you can perfectly skip the rope. The tester comes with a small tray for holding loose stones as well as a leather bag.

PROS
  • The tester is easy to use
  • The tester is smooth and tangle-free
  • The tester produces results extremely fast

CONS
  • One customer reports that the tester broke after a few uses

Rs Mizar Diamondnite Dual Diamond Tester

Using DiamondNite Tester you can test non-diamond, synthetic Moissanite, and real diamonds at one touch. There is only an eight-second warm-up time between tests and a one-second recovery time! Portable and powered by a 9-volt battery (included), this tool is perfect for traveling. The three-minute shutoff feature saves battery life. It also comes with an easy-to-read, gray shell that is shock-resistant.

PROS
  • The tester is easy to use
  • The price is worth its value
  • The tester provides a 2-year warranty 

CONS
  • One customer reports that the tester they received had a bent tip

Anbane High Accuracy Professional Diamond Tester

This device is designed to test diamonds in a safe, quick, and accurate manner. The diamond tester is equipped with an easy-to-carry carrying case. It does not cause any damage to the diamond in any way. If the stone is a real diamond, a green indicator will appear on Diamond Selector II. When the user accidentally touches metal instead of stone, it will make a continuous buzzing sound. The Moissanite Tester will automatically turn off after 10 minutes of use, and the green power indicator light and long beeping sounds will alert the user to turn it off.

PROS
  • The tester is easy to use
  • The price is worth its value
  • The tester provides a portable design

CONS
  • One customer reports that they didn’t receive a battery as it was advertised 

DANOPLUS Professional Diamond Moissanite Tester

This device is designed to help you easily identify diamonds and moissanite from fakes, as it is capable of identifying gemstones smaller than 2 mm. No adjustments are required in the LED bar graph via volume control to match stones of differing sizes, as in other diamond testers. This tester has a metal detector that signals if the metal setting is touched instead of the stone. In the absence of this feature, other testers can indicate a real diamond even if the diamond is fake when you unknowingly touch the setting. The rubber paint finish on this device gives it a non-slip, safe, comfortable feel. Additionally, it is equipped with an elastic tip probe for testing and identifying stones of small sizes. The compact design makes it easy to carry when you need it where you need it. In addition, the probe can be used continuously for up to 2 hours and is quick to warm up in 25 seconds.

PROS
  • The tester is easy to use 
  • The tester is accurate and reliable
  • The tester provides a non-slip design

CONS
  • There are no cons reported for this tester


In Conclusion 

We hope you found the right diamond tester that best suits your needs. Picking the appropriate product should be simple if you remember the basic features and your needs.


Other Products You May Need

We hope you enjoy these products! But keep in mind, Grit Daily might take a small commission on the items recommended here—but that doesn’t mean we don’t believe in them. We only recommend products that we would buy or use ourselves, so don’t be wary of our suggestions. 

Cory Mackey is a Staff Editor and the Affiliate Director at Grit Daily.

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