10 Best Diamond Moissanite Tester of 2025

Tested and Reviewed: Top 10 Diamond Moissanite Tester deals with expert ratings from 8.1 to a perfect 10

May 2026 Edition

Editor's Choice

9.7

Valkynos

Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection, Portable Gem Checker for Novice & Experts – Battery Included

Editor's bottom line:

“This diamond moissanite tester is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

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 (1035°C) 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.

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Picked by 397 people today

9.5

UVER

Diamond SE Tester- Professional Diamond & Moissanite Detector, 2-Second Results with LED/Sound Alert, Portable Gemstone Tester for Jewelry, Pawn Shops, Home Use (Includes Case & Batteries)

Main Highlights

INSTANT, LAB-PRECISE RESULTS: Accurately distinguish between genuine diamonds and moissanite, cubic zirconia, or other simulants in just 2 seconds. Our advanced thermal conductivity sensor provides professional-grade accuracy you can trust for buying, selling, or appraising jewelry.
CLEAR DUAL ALERT SYSTEM: Get unmistakable verification with a bright GREEN LED light and audible beep for real diamonds, and a RED LED light for imitations. Features adjustable volume and a convenient "Battery OK" indicator for reliable operation every time.
BUILT FOR PROFESSIONAL & HOME USE: Engineered for durability with a robust metal probe and automatic shut-off. Its compact, portable design comes with a protective travel case, making it the perfect tool for jewelers, pawnbrokers, collectors, and DIY enthusiasts alike.
probe to the gemstone (loose or mounted), and read the result. No technical skills needed. It's the fastest way to gain confidence and protect your investment from costly mistakes.
COMPLETE READY-TO-USE KIT: Includes the Diamond SE Tester, a protective probe tip cover, a quality carrying pouch, batteries, and a detailed manual. Backed by our 2-Year Warranty and dedicated US-based customer support.

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9.5

HMKIS

HMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier, Diamond Selector for Novice and Expert (Non-Rechargeable)

Main Highlights

[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

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9.2

Presidium

Presidium Multi Tester III (PMuT III) All-in-One Instrument for Testing Diamonds, Moissanites and Diamond Simulants

Main Highlights

ALL-IN-ONE INSTRUMENT: The worlds first tester that tests for both colorless diamonds and moissanites in a single instrument. Powered by 3 AAA batteries.
EASY TO USE DESIGN: Ergonomic handheld design with a rubberized anti-slip grip for easy handling. Light and portable with a convenient carrying case.
THINNEST RETRACTABLE PROBE TIP: Retractable probe tip that ensures consistent pressure against the gemstone during testing for more reliable results. With the industrys thinnest probe tip size of 0.6mm, the PMuT III tests colorless diamonds as small as 0.02ct.
CLEAR, CONVENIENT DISPLAY: 180-degree multi-viewing LED display for easy readability for either right or left-handed use.

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9.0

Siziviki

Diamond Tester, Professional Jewelers' Gemstone Detector, High Accuracy Diamond Checker Pen Professional for Jewelers, Gem Tester (Jewelry-Only Detection)

Main Highlights

ACCURATE DETECTION : Our professional diamond tester pen (a reliable gem tester) features a sophisticated sensor for precise gemstone identification (Diamonds/Moissanite: 9+ lights + beeps; Jade: 5-6 lights; Crystal/Glass: 5-7 lights). (Jewelry-Only Detection Not for metal/gold or gold testing kit use)
STANDARD OPERATION : Insert battery (Gently press the wire and the cables to hold battery will secure it in place) Power on MUST preheat 30s (critical) Adjust indicator to 4th mark (do not skip) Hold back metal plate Probe 90° perpendicular to gemstone. Reset to 4th mark before each test
METAL DETECTION NOTE : Not for metal/gold or gold testing kit use metal has similar thermal conductivity to diamonds (normal beeping, not a defect). Consistent with title "Jewelry-Only Detection"
PACKAGE CONTENTS : Diamond tester pen + user manual + 9V battery + testing platform. Read the manual first to maximize accuracy with your diamond detector
PRECAUTIONS : Avoid windy/cold conditions (15-25 recommended); Keep probe perpendicular to gemstone; Turn off power after using this diamond checker
SEAMLESS SHOPPING EXPERIENCE : Useful usage guidance for this diamond tester and gem tester is available via included resources. Note: Only valid for gemstone testingnon-diamond items cause incorrect readings
VIDEO GUIDE INCLUDED : Step-by-step operation & troubleshooting video covers preheating, calibration, perpendicular alignment, solves 90% of usage issues. Skipping any required steps may lead to inaccurate detection results

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8.8

GemOro

GemOro UltraTester 3+ Diamond Tester | Test Diamond, Moissanite, White Sapphire Gemstone | Precision Tool with Expert Professional Reading & Accuracy

Main Highlights

STONE IDENTIFICATION: This new enhanced testing technology is a breakthrough in the identification, detection, and separation of diamonds from other materials such as CZ, moissanite, and white sapphire. This technology has the capability to identify stones with low conductivity, allowing accurate detection and separation of diamonds from other materials. It evaluates stones using cutting-edge scanning techniques and advanced software analysis, ensuring a highly accurate test result.
LED STONE ILLUMINATION & DETECTION: This is a high-performance diamond tester with LED stone illumination and UV fluorescence detection. It uses a unique retractable probe tip that is designed for enhanced durability. The LED stone illumination will help you see the subtle nuances of the diamond, such as clarity, while the UV fluorescence detection allows you to detect any potential diamond treatments. This is the perfect tool for diamond grading, authentication, and identification.
POWERED BY USB Type-C: This versatile device comes with multiple power sources. It can be powered by either your USB Type-C cable, rechargeable NiMH batteries, or AAA Alkaline batteries with a battery-saving auto-off function. It includes (3) user-replaceable AAA NiMH rechargeable batteries, a universal multi-voltage 100V240V AC adapter / charger cube, and a premium USB Type-C cord. You get to choose the power source that works best for you, and the device will be ready when you need it!
DESIGNED IN THE USA: The sleek ergonomic shape of the ULTRA TESTER 3+ allows it to comfortably rest in your hand, and its LED stone illumination makes it even easier to see what you're testing! Designed in the USA and recommended by Charles and Colvard. It comes with 2-year limited replacement warranty on probe tip - Lifetime warranty on the electronics. This tester is not intended for Emerald.
GEMORO TESTERS: GemOro is a leading manufacturer of gold and platinum testers, as well as diamond, moissanite and white sapphire testers. They are trusted by professionals and hobbyists alike. GemOro's testers are known for their accuracy, reliability, and ease of use.

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8.6

Aepiraza

Aepiraza Moissanite Diamond Tester Pen, 2 in 1 Diamond & Moissanite Tester Pen for Non-Diamond, Synthetic Moissanite or Genuine Diamond Testing (Without Power Cord)

Main Highlights

Highly Accurate Testing: You must continue the test for one second after you first hear the beep before you can remove the detector from the gem stone, this is because the diamond test is done first. The moissanite test is completed after 1/2 second
Easy to Use: If it is simulation or non-diamond, nothing happens. If it is diamond, the buzzer will sound and the green light (diamond) will come on for about 6 seconds. If it is moissanite, the tone will change and the light will switch from green to blue (moissanite) in 1/2 second
NOTE: The products are battery powered, with batteries, Without power cord. Battery and power cord can not be used at the same time, when installed battery can not use the power cord
Hold the tester with the right hand so that the fingers rest on the back metal plate. The other hand must hold the metal to support the gemstone or metal test plate. Gently touch the tip of the probe at the center of the gemstone, (approximately 250 mg of pressure) Hold the tester perpendicular to the gemstone table for one second
If the tone changes when you remove the probe, you must retest because you may have contacted a metal finding when you removed the probe. If the yellow ready indicator light flashes or fails to come on, you will need to replace the 9V battery; alkaline batteries are recommended

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8.3

UVER

High Accuracy Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection,Diamond Tester, Professional Jewelers' Gemstone Detector (Diamond Tester Pen)

Main Highlights

Identify genuine diamonds instantly. Accurately distinguish authentic diamonds from simulants like cubic zirconia, glass, crystal, or white sapphire using advanced thermal conductivity. Perfect for screening inherited collections or verifying finds at flea markets and pawn shops, Includes a Standard 9V Battery (same type available in the U.S., easily replaceable) for immediate testing.
365NM UV & MOISSANITE SCREENING : The integrated 365nm UV light reveals fluorescencean important clue for authenticity. Since Moissanite and fakes show unique color reactions (unlike diamonds), this is a critical second layer of verification. Note: Thermal testing alone may be inconclusive for Moissanite; always use the UV light for a combined assessment.
FAST 0.5S INSTANT RESPONSE : After a 25s warm-up, simply touch the stone for a 0.5s response, ensuring a seamless experience for beginners.Using a high-sensitivity thermal probe, hold the conductive panel on the back and touch the stone at a 90° vertical angle. A Red LED and beep instantly signal when a genuine diamond is detected.
PRECISION TESTING STANDARDS :For maximum accuracy, follow these guidelines: Use with bare hands (no gloves) to ensure proper conductivity; test at room temperature (5095°F); and ensure the diamond is 0.02 carats or larger.
It is the easiest answer for the vast majority of retail jewelers,pawn brokers and chain stores when faced with the decision of which diamond selector to buy.
[Package include]:1 x Diamond Tester Pen, 1 x Tweezers,1 x Testing Platform,1 x 9V battery,1 x a comprehensive instruction manual.

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8.1

DANOPLUS

DANOPLUS Diamond & Moissanite Tester Combo - Professional Diamond Detector with Audible & Visual Alarm - High Accuracy & User-Friendly - Ideal for Jewelers, Gemologists & Professionals

Main Highlights

High AccuracyThe Diamond&Moissanite Tester is designed to help you quickly determine diamond and moissanite from other fake stones
User-FriendlyDiamond Detector is easy to operate, hold the meter(by placing your finger on the metal on the back) in 90 Degree position to insert to the surface of diamond, then Green light(diamond) or Blue light(moissanite) will appear on the indicator
High-precision chipDiamond Tester is able to detect metal, the inditor will appear orange signal if touch metal material. If without this function, other testers selling on amazon can indicate a real diamond when you unknowingly touch the setting even if the diamond is fake
Ergonomic DesignDiamond Tester is designed with rubber paint finish, this device provides safe, non-slip comfort and control. It is also equipped with a fine elastic tipped probe for testing and identifying stones with small sizes. When the device stops working due to low battery, please replace the battery or use an adapter (not included) for charging
Portable & ConvenientIt's compact-sized design, it's easy to bring when you need it, where you need it. It also allows continuous use of up to 2 hours and quick probe warm up time of 25 seconds

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8.1

Tyenaza

Tyenaza Diamond Tester, High Accuracy Jewelry Diamond Tester Pen, Professional Diamond Selector Gem Tester with Diamond Selector II, Moissanites Tester, 2 Manuals, 2 Trays

Main Highlights

Quick Precise Diamond Testing Diamond Selector II can help you to distinguish whether your diamond is real or fake. It is designed for quick, precise, and safe diamond testing.
Convenient PU Bag Diamond Selector II is equipped with a PU bag and small testing tray for holding loose stones
Versatile The tester has a very compact design, ideal for buying jewelry, buying diamonds, selling real estates, auctions, etc. The gemstones must be clean, dry and at room temperature.
LED display This tester is supplied with a PU housing and a small test platform for holding loose stones. LED light and audio result display. Easy calibration for stones of different sizes.
How to Use Green indicator will be showed on Diamond Selector II if the stone is a real diamond. It will make continuous buzzing sound when user accidentally touches metal rather than stone

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Our Best Overall Choice

Best Choice

9.7

Valkynos

Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection, Portable Gem Checker for Novice & Experts – Battery Included

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

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 (1035°C) 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.

Show Price

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