The 6 Best gem testers (2023 reviews)

The stillcool gem tester is long-lasting, rigid and fits well with your daily purpose like a dream. It is a diamond it will read as a diamond. The professional diamond tester will light up over 9 and emits audible sounds. This will let you know what gold and silver you have to. It is within the range of 5-35 degrees celsius, and the humidity is below.

The dial is a bit touchy. It is a flame fusion stone. It is almost easier to test them while holding rather than using the stone holder. The volume is very narrow with sound.

Why We Like This:

Simply enough to just add batteries
Great value, easy to use and accurate
Great tool to have for detecting diamonds

Best For price: Dupeakya gem Tester

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The dupeakya gem tester should be able to handle its purpose and duties with ease. It is a portable electronic device for distinguishing real diamonds from other simulated stones. It is used for testing sapphire, ruby, crystal, agate and other stones. The tester differentiates between natural crystals and man made crystals "synthetic" like CZ's. It works for all diamonds, including black diamonds and white diamonds.

This has an electric conductance test to warn you of metal contact. The device needs to be restarted after a few minutes of use to be recalibrated. It comes with a soft case and small stone tray. It is great tool for a fast look at estate sales, no more guessing if it is glass or stone. This device works as long as you follow the instructions in the manual.

Why We Like This:

Works great can test other stones
Gives a glass reading on all semi precious stones
Great tester for gems and diamonds
Highly recommended for anyone who cannot afford to be fooled

Best For blue topaz: Presidium gem Tester

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The presidium gem tester might be a relatively new release, but it's still nothing short of impressive this year. The Presidium gem tester ii provides a quick and easy way to identify diamonds / moissanites and separates up to 16 common colored gemstones based on their thermal conductivity with its clear and direct analog display. It features the industry’s thinnest retractable probe tip. It is developed to distinguish between diamonds and its other simulants using the principles of thermal conductivity.

This is great for Peridot, Blue Topaz, and Aqua Marine gem stones. It comes with a soft case. It is easy to use, although sometimes the calibration can be tricky. Even with both tools, it takes a keen eye, and training to truly know what you're looking at. This device is an excellent tool for anyone but a big plus for boutiques.

Why We Like This:

Good product, easy to calibrate and accurate
Come in colors that can imitate a lot of natural stones
Redesigned to be more compact, sturdy and portable
Affordable, portable and easy to use, but has accuracy issues

Best For estate sales tag sales: Hqdz gem Tester

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If you often find yourself scrambling for convenient and suitable tester, hqdz gem tester should be your first option for buying. Hqdz’s diamond tester pen and 60x led lighted loupe combo is a must have tool kit when you are going to a garage sale, flea market, swap meet, etc. It is reliable or precise enough to be used by jewelers. The test takes a few minutes, please turn off the power after the test is complete. It comes with its own convenient carrying cases.

It is powered by a DC 9v battery x 1 ( included) to test diamond turn on the switch. It is great for estate sales and tag sales. Alternatively, its also a great tool to have when testing your own jewelry.

Why We Like This:

Large / small switch for testing diamonds / - 8 points
Great and comes with a lot
Good brand reputation

Best For Diamond Test: Zyyini gem Tester

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The zyyini gem tester's material feels more premium than its price would suggest. This diamond tester has a very compact design and helps you to tell the difference between a real diamond and a fake diamond. It is supplied with a pu housing and a small test platform for holding loose stones. It is a continuous hum if the user accidentally touches metal rather than stone. The green indicator is shown when the stone is a real diamond.

The tester is light, compact and easy to transport. It has a very compact design, ideal for buying jewelry, buying diamonds, selling real estate, auctions, etc. It is easy to use, even for a beginner. The tones must be clean, dry and at room temperature. These are very helpful to have if you collect any jewelry.

Why We Like This:

Easy calibration for stones of different sizes
Helps assist in valuing the stones and not being taken advantage of
Diamond tester for a quick, precise and y diamond test

Best Easy To Use: Hqdz-Td gem Tester

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The hqdz-td gem tester should be able to handle its purpose and duties with ease. The Diamond tester pen and 60x led lighted loupe combo is a must have tool kit when you are going to a garage sale, flea market, swap meet, etc. It provides enough light at any dim conditions. If the stone tested is a diamond, the led lights will light up as the stone passes each test conducted by the diamond detector.

It makes it super simple by making a beep and lighting up to tell you that it is real crystal, a simulant such as cubic zirconium ( cz) will be no reaction. It comes in a convenient case that is soft but the end protects the probe rom getting damaged. There is a side pocket that holds the little metal piece that holds loose stones. Jeweler's loop makes it possible for you to distinguish and see objects clearly.

Why We Like This:

Designed for gems, jewelry, coins, stamps, rocks, watches, hobbies, antiques, models, photos industry, etc
Emits audible sounds to easily differentiate the readings
A must for someone who has jewelry