Best Diamond And Gem Tester

Peter | 06-03-2026

Navigating the many Best Diamond And Gem Tester options on the market – from major brands like HMKIS,Siziviki,GTE,Hqdz,Presidium,Hqdz-td to lesser-known names – can feel overwhelming. But we’re here to help simplify your search for the best products.

After extensive research testing hundreds of Best Diamond And Gem Tester, we’ve selected the top contenders. Our number one recommendation is HMKIS Best Diamond And Gem Tester based on its stellar performance and quality. Below you’ll find more of our top-rated picks for the best Best Diamond And Gem Tester currently available.

Be sure to consult our handy buying guide as well for expert tips on choosing the right Best Diamond And Gem Tester to suit your individual needs. It has all the crucial information you need to make an informed purchasing decision. With our guidance backing your choice, finding your perfect match will be smooth sailing!

Editor's Choice
Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying
Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying
Premium Pick
Gemtone All-in-One Gold, Silver, Platinum & Diamond Jewelry Testing and Appraisal Kit with
Gemtone All-in-One Gold, Silver, Platinum & Diamond Jewelry Testing and Appraisal Kit with
Budget Pick
HMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier,
HMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier,

Top 10 Best Diamond And Gem Tester

We researched and compared the top products in the Best Diamond And Gem Tester category to provide you with these recommendations.

1. HMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier,

  • [Power Upgrade] The HMKIS diamond tester offers two power supply options: Type-C and 9V Power (includes a 1m Type-C cable). Utilizing a Type-C power supply delivers a more stable and precise voltage output, thereby enhancing the accuracy and reliability of experimental and test results. Opting for the Type-C power supply is highly recommended for optimal performance. PLZ NOTE THIS IS Non-Rechargeable !
  • [Rapid Assurance] The Professional Diamond Selector II swiftly verifies the authenticity of diamonds with precise accuracy. Designed for quick and secure testing, this diamond selector features an LCD display, LED indicator, and large/small switches for testing diamonds. Audible signals provide further assistance in interpreting readings, ensuring a swift and confident evaluation process.
  • [Easy Use]The HMKIS Diamond Tester Pen is a user-friendly tool that eliminates the need for professional knowledge in diamond testing. With just a few simple steps, anyone can determine the authenticity of a diamond. By turning on the Diamond Tester Pen detector, selecting the diamond size, and placing the tip of the tester on the gemstone, users can easily identify whether the stone is a genuine diamond or if it is made of glass, crystal, or cubic zirconia based on the results. The red light and beep emitted by the diamond tester indicate the presence of a diamond, making it a convenient and easy-to-use tool for anyone in need of quick and accurate diamond testing.
  • [Jewelers Loupe] The 60X LED Jewelers Loupe with batteries is a versatile tool that can be used for a wide range of applications. Whether you are examining gems, coins, antiques, stamps, conducting readings, inspections, jewelry appraisals, studying rocks, watches, calligraphy, paintings, pursuing hobbies, collecting antiques, building models, working in the photo industry, testing electronic products, or simply using it for tasks in your home life or office, this Jewelers Loupe is an essential tool. Its compact design and powerful LED lights make it convenient for use in various settings, providing clear and detailed magnification for all your viewing needs.
  • [Adjust Size]:We have to choose the diamond size before using the diamond tester.Otherwise we may get the incorrect result.
  • [Touch Panel]: We have to touch the panel on the back when testing. Othersize we will get a wrong result.
  • [Incorrect Contact]: When we have incorrect contact, this diamond tester pen will have a flashing OR it will turn off. When you testing metal,skin,or something else.
  • [Warm Notice]:Make sure to test according to the correct testing procedure, avoid using the diamond tester on unsuitable items(metal,skin,water and ect.), to ensure accurate testing results. Any improper operation may affect the accuracy of the test.
  • [Package include]:1 x Diamond Tester Pen, 1X 60XJewelers Loupe,1x 1M USB Cabel,1 x Testing Platform,1 x User Manual

2. Diamond Tester, Professional Jewelers' Gemstone Detector, High Accuracy Diamond Tester Pen

Diamond Tester, Professional Jewelers' Gemstone Detector, High Accuracy Diamond Tester Pen
8.9

Siziviki

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  • ACCURATE DETECTION: Our diamond tester pen features a sophisticated sensor system that accurately identifies diamonds, with 5 lights for glass, 5-6 for jade, 5 for cubic zirconia, 7 for gemstone crystal, and 9 for diamonds and moissanite. It's designed to provide clear distinctions for various gemstones, ensuring you get precise results
  • STANDARD OPERATION: Insert the battery, power on the gem tester, then preheat the tester for 30 seconds. Adjust the indicator to the fourth mark (Otherwise, inaccurate results may be obtained), press the triangular metal plate at the back with your finger, and position the probe perpendicular to the gemstone. For diamonds, the light will jump to the ninth segment or higher (red light area) and emit beeps. Always reset to the fourth mark before each test.
  • METAL DETECTION RESTRICTIONS: The diamond tester is not designed for metal, gold, plastic, fingers type testing. When testing metals, it will emit a rapid beeping sound due to the similarity of the thermal conductivity of the metal to the diamond. It may mimic diamond readings and beep when exposed to high thermal conductivity products. Testing gemstone diamonds only
  • PACKAGRE CONTENES: The diamond detector complete set includes a diamond tester pen, user manual, 9V battery and testing platform for your convenience. Before you begin testing, please carefully read the instructions and tips in the user manual to help you achieve the most accurate results from the diamond tester
  • PRECAYTIONS: For accurate testing, avoid testing in windy conditions. Position the tip of the diamond tester professional perpendicular to the gemstone for accurate readings, observe the light pattern to determine the stone's authenticity. Always turn off the power after testing to conserve battery life
  • SEAMLESS SHOPPING EXPERIENCE: Our dedicated customer service is ready to assist you with any questions you may have about product usage, ensuring you can fully leverage our diamond tester. Note: Only valid for gemstone diamond testingnon-diamond items will cause incorrect readings
  • VIDEO GUIDE INCLUDED: For the easiest and clearest visual instructions, watch our step-by-step operation and troubleshooting video in the diamond detector images or description section

3. Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic

  • ALL-IN-ONE GOLD, SILVER, PLATINUM, & DIAMOND JEWELRY TESTING & APPRAISAL KIT
  • FUN, FAST, AND ACCURATE! DETERMINES THE KARAT OF GOLD, SILVER, AND PLATINUM JEWELRY IN SECONDS!
  • AUTHENTIC GTE 3''x6'' JEWELRY TOUCHSTONE FOR SAFE TESTING THAT WON'T DAMAGE YOUR JEWELRY
  • JEWELRY TEST KIT-DIAMOND TESTER-TRIPLET MAGNIFIER
  • A MUST-HAVE FOR ANYONE WHO WANTS TO INVEST IN GOLD, SILVER, PLATINUM, OR DIAMONDS!
  • *BONUS* GTE ACID NEUTRALIZER QUICKLY CLEANS STONE

4. Diamond Tester,High Accuracy Jewelry Diamond Tester Professional Diamond Tester Pen Jeweler Tool for

  • [Fast and safe ]:Professional Diamond Selector II will indicate genuine diamond or fake.It is designed for quick, precise, and safe diamond testing.LCD display & LED indicator.Uses large / small switches for testing diamonds,Emits audible sounds to easily differentiate the readings.
  • [Bare Hands Operation]:All the tests must be done by your bare hands. If you put on your gloves, the metal alert will not function since a normal moisture levelof your hands is necessary for operation.All test must be done by TWO hands, one for hold the diamond and one for the diamond tester. As for the hand which hold diamond tester, you have to touch the electricity conductive panel on the back of the unit.If you test the diamond just by one hand, you will get a wrong result.
  • [Beeping Upon Startup]:Ensure correct installation and adequate power in the test pen battery. Also, clean the test pen probe as maintaining its cleanliness can enhance testing efficacy.A beeping sound upon powering on signifies the need for initialization settings. Consult the table on the rear of the machine for the specific initialization settings considering the diamond's temperature and size. Adjust the initial number of illuminated lights by rotating the knob (the default setting is to have 4 lights illuminated at room temperature).
  • [High-Frequency Sound when Testing Metal]:The high-frequency sound during metal testing is due to the test pen's operational principle, which relies on thermal conductivity to distinguish between diamonds and fake gemstones. Since metal possesses thermal conductivity similar to diamonds, it generates a high-frequency sound during testing.
  • [Simple to Use]:Hqdz Diamond Tester Pen is simple to operate to get results, professional(s) are not required. Simply turn on our Diamond Tester Pen detector; place the tip of the Diamond Tester on the gem stone (lightly pressed is sufficient) and If the stone is fake, crystal or cubic zirconia, the tester will not beep.
  • [ Note]: The battery temperature is lower than 10 degrees Celsius, which seriously affects the use time Don't wear glovesDon't detect metal Best to measure in no wind conditionsThe operating temperature is within the range of 10-35 degrees Celsius, and the humidity is below 80% When testing diamond, your right index finger must keep touching the metal panel on the back of the tester. Please turn off the power after the test to save power.
  • [Package include]:Diamond tester is battery powered for convenience.Requires 1 standard 9v battery, which is included.Package include:1 x Diamond Tester,1 x Leather Pouch Case,1 x Testing Platform,1 x User Manual,1 x DC 9V battery.

5. Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying

Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying
9.8

Presidium

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  • INCLUDED ASSISTED THERMAL CALIBRATION | Now easily self calibrate your device to your testing environment
  • INDUSTRIES MOST TRUSTED | Gemstone tester redesigned to be more compact, sturdy and portable
  • THINNEST RETRACTABLE PROBE TIP I PGT II features the industrys thinnest retractable probe tip
  • VERSATILE AND RELIABLE | Consistent and reliable results every time. Identifies diamonds/moissanites
  • SIMPLE & EASY TO USE | Clear and easy-to-read analog dial; Can differentiate 16 types of gemstones. IMPORTANT TO NOTE | The calibration of this product may be affected during shipping. If you experience issues with calibration, please reach out to the seller for assistance prior to returning the item.

6. Professional Diamond Tester Pen, High Accuracy Jewelry Diamond Tester, Electronic Diamond Gem Tester

Professional Diamond Tester Pen, High Accuracy Jewelry Diamond Tester, Electronic Diamond Gem Tester
8.7

Hqdz-td

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  • Easy to use Place the tip of the diamond tester gently on the gemstone. If the diamond is fake, crystalline or cubic zirconia, the tester will not beep. An excellent diamond tester tool kit, suitable for handling any exposed or mounted diamonds and gems. Popular among professionals, hobbyists, coin enthusiasts, and business owners alike. Excellent tools. Excellent Value. Great gift idea.
  • Intuitive design Our gemstone tester has an intuitive design, light and portable, and the jewelry diamond tester is equipped with LED lights and audio instructions. As long as the tip is perpendicular to the test masonry and the switch is pressed, the result can be obtained.
  • Quick IdentificationYou just turn on our diamond test pen detector; place the tip of the diamond tester on the gemstone, and a single tap is enough. In providing fast and accurate results. You will be able to know in a few seconds whether an item is fake or not.
  • Adjust SizeWe have to choose the diamond size before using the diamond tester.Otherwise we may get the incorrect result.
  • Touch PanelWe have to touch the panel on the back when testing. Othersize we will get a wrong result.
  • Incorrect ContactWhen we have incorrect contact, this diamond tester pen will have a flashing OR it will turn off. When you testing metal,skin,or something else.
  • Warm NoticeThe Diamond Tester Pen works by measuring the thermal conductivity of an object.Make sure to test according to the correct testing procedure, avoid using the diamond tester on unsuitable items(metal,skin,water and ect.), to ensure accurate testing results. Any improper operation may affect the accuracy of the test.
  • Professional Diamond Selector After powering on, turn the wheel to keep 4 green lights on to finish the Initialization. Otherwise you will get inaccurate results.For Diamond SimulantsNo Sound and No Red lamps light on.[Package include]:1 x Diamond Tester Pen, 1X 60XJewelers Loupe,1 x Testing Platform,1 x User Manual,1 x Tweezers.
  • Accessory tools Magnifying glass (small microscope) equipped with 60X LED illumination. Diamond test pen can be used for gems, coins, antiques, stamps, reading, inspection, etc. Diamond tester pen is designed for fast, precise and safe diamond testing.
  • Professional Service If you have any questions about our diamond tester pen, please contact us. We have a professional dedicated to assisting you and help you answer any questions you may have.

7. Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s

Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s
8.9

Valkynos

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  • After-Sales Service: 30-day unconditional return or exchange. For any issues or battery replacement (same type available in the U.S.), please contact us
  • Fast & Accurate Diamond VerificationThe high-accuracy diamond tester pen has advanced thermal conductivity; this tester accurately distinguishes real diamonds from common fakes like crystal or cubic zirconia. Ideal for home use, collectors, or resellers
  • Built-in UV Light for Fluorescence DetectionDiamond tester professional features a built-in UV light to reveal diamond fluorescencean important clue in verifying authenticity. Different materials show different reactions under UV, making this feature useful for deeper assessment
  • Real-Time Feedback with LED Lights & SoundsAfter a 25-second warm-up, hold the conductive panel on the top with your finger, tip the vertical diamond 90 degrees: a red LED flashes and a buzzer sounds when a real diamond is detected
  • Testing Tips for Best Accuracy Use with bare hands (avoid gloves) Best results at room temperature (1035C) Accurate for diamonds 0.02 carats and larger
  • Compact & Ready for TravelDiamond tester pen compact size with protective case makes it easy to keep in your bag or drawer, leather pouch keeps your tester safe perfect for on-the-spot diamond checks at home, in stores, or while traveling.

8. Diamond Tester Pen,Jewelry Diamond Tester Pen+30X 60X Mini LED Magnifying Jewelry Eye Loupe Jewelry

  • Clear screen designThese high accuracy diamond testers are designed with a clear screen, so you can get the useful data quickly; The item you are testing will be a true diamond when the data is above 9, and a true emerald crystal agate when the data is 7, saving your time to recognize.
  • TWO-HANDS TEST It is essential to perform all tests using two hands - one to hold the diamond and the other to operate the diamond tester. The hand that holds the diamond tester must make contact with the electricity conductive panel on the back of the unit. Testing the diamond with just one hand will result in inaccurate readings.
  • FOR DIAMONDFor testing diamond, it will emits beeping-beeping-beeping in a low frequency, 1 time/second. When Testing Imitation stone,such as cubic zirconium ( CZ ), crystal, glass, there will be no sound, and the red lamp won't light.
  • Please noteThis diamond testing pen is designed as an entry-level tool for beginners. It is capable of distinguishing between diamonds and imitation gemstones. However, it is not able to differentiate between natural diamonds and laboratory-grown diamonds (also known as Moissanite).
  • Multiple uses The gold testing kit is suitable for testing various items, such as diamonds, jades, emeralds, crystals, agates, gems and so on, making it possible for you to distinguish and observe them clearly and easily.
  • Practical Jewelry loupe The mini LED foldable magnifying is equipped with 30X 60X lens, portable and reliable for you to see the item you want to know, no worry about missing the details of gems; And you can also share them with your family members or good friends to enjoy much fun.

9. Gemtone All-in-One Gold, Silver, Platinum & Diamond Jewelry Testing and Appraisal Kit with

Gemtone All-in-One Gold, Silver, Platinum & Diamond Jewelry Testing and Appraisal Kit with
9.8

Gemtone

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  • Complete Testing Kit Includes jewelry test solutions, digital scale, diamond tester, touchstone, magnifier, files, and reference bars for evaluating gold, silver, platinum, and diamonds.
  • Digital Scale Compact stainless-steel platform with 0.01 g accuracy, weighing modes for g/oz/dwt/ozt/ct/gn, and up to 100 g capacity.
  • Larger 15 ml Bottles Each test solution bottle is 0.5 oz (15 ml), three times larger than many common 5 ml bottles available, providing more tests per bottle.
  • Diamond Tester & Accessories Portable electronic tester with included sizing gauge and estimator for distinguishing diamonds from common simulants.
  • Magnifier & Files 30X triplet loupe for inspecting fine details and a 10-piece diamond needle file set for preparing samples.
  • Reference Bars Included Practice with a 5 gn silver bar and a 5 gm gold-plated bar to become familiar with testing reactions.
  • Neutralizer solution for cleaning test stone between use

10. SmartPro SPGE-I Gem Eye I Gem and Diamond Tester Smart Pro

SmartPro SPGE-I Gem Eye I Gem and Diamond Tester Smart Pro
9.1

Smartpro

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  • High efficiency
  • Industrys thinnest probe tip (0.48mm) for testing diamonds as small as 0.01ct
  • Identifies metals, simulants and diamonds instantly
  • Portable tester that can be used anywhere
  • No waiting time between tests

Peter

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