7 bestDiamond Testersof July 2025
112M consumers helped this year.
1
PRESIDIUM DIAMONDMATE-C ELECTRONIC DIAMOND TESTER
PRESIDIUM
9.9
2
Molo Best Version Diamond Tester＋60X LED Magnifying Glasses Jeweler Tool Kit Combo，for Novice and Expert - Diamond Selector II 9V Battery Included Diamond Tester+
Molo
9.8
3
Diamond Tester Pen, High Accuracy Jewelry Diamond Tester Professional Diamond Selector for Novice and Expert Jewelry Diamond
GAIN EXPRESS
9.6
4
High Accuracy Diamond Tester Professional Jeweler For Novice and Expert - Diamond Selector II 9V Battery Included
Hqdz
9.3
5
QUMOX Portable Diamond Selector II V2 Gemstone Tester Tool + 60X LED Loupe
QUMOX
9.1
6
Diamond Tester Pen,High Accuracy Jewelry Diamond Tester＋40X Full Metal Jewelers Eye Loupe,LED/UV Illuminated Pocket Folding Magnifying Glass,Professional Diamond Selector for Novice and Expert
Hqdz
8.8
7
Diamond Tester Pen, High Accuracy Jewelry Diamond Tester＋200g/0.01g Mini Jewelry Scale＋60X Mini LED Magnifying, Professional Diamond Selector for Novice and Expert, Thermal Conductivity Meter
UVER
8.5
Related Reviews You Might Like
A Guide to Selecting the Best Diamond Testers
Choosing a diamond tester can feel overwhelming, but understanding the key features will help you make a confident decision. Diamond testers are handy tools that help you distinguish real diamonds from imitations by measuring certain properties like thermal or electrical conductivity. The right tester for you depends on how often you plan to use it, what types of stones you want to test, and how much convenience you need. By focusing on the main specifications, you can find a tester that matches your needs and gives you reliable results.
Testing Method
The testing method refers to how the device determines if a stone is a diamond. The most common methods are thermal conductivity and electrical conductivity. Thermal testers check how quickly heat moves through the stone, while electrical testers measure how well the stone conducts electricity. Some advanced testers combine both methods for greater accuracy. If you only need to check diamonds, a thermal tester may be enough. If you also want to test for moissanite (a common diamond simulant), a dual tester that uses both methods is more reliable.
Accuracy
Accuracy is about how reliably the tester can distinguish between real diamonds and other stones. Higher accuracy means fewer false positives or negatives. Basic testers may sometimes mistake moissanite for a diamond, while more advanced models can tell them apart. If you need to be absolutely sure, especially for professional or resale purposes, look for testers known for high accuracy. For casual or occasional use, a standard tester may suffice.
Ease of Use
Ease of use covers how simple the tester is to operate, including the clarity of its display and the steps needed to get a result. Some testers have straightforward lights or sounds to indicate results, while others may require more interpretation. If you’re new to diamond testing or want quick answers, choose a model with clear, easy-to-understand indicators and minimal setup.
Portability
Portability refers to the size and weight of the tester, as well as whether it runs on batteries or needs to be plugged in. Smaller, battery-powered testers are easy to carry and use anywhere, making them ideal for people who travel or need to test stones on the go. Larger or plug-in models may be better for stationary use, such as in a shop or at home.
Durability
Durability is about how well the tester holds up to regular use and accidental drops. Testers with sturdy cases and protective tips last longer, especially if you plan to use them frequently or carry them around. If you expect to use the tester often or in different locations, look for one with a reputation for being robust and reliable.
Stone Size Range
Stone size range indicates the smallest and largest stones the tester can accurately check. Some testers work best with larger stones, while others are sensitive enough for small gems. If you plan to test a variety of stone sizes, make sure the tester can handle both small and large stones effectively.
Best Reviews Guide Newsletter
Get exclusive articles, recommendations, shopping tips, and sales alerts
Sign up for our newsletter to receive weekly recommendations about seasonal and trendy products
Thank you for subscribing!
By submitting your email address you agree to our Terms and Conditions and Privacy Policy