Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
Advertising Disclosure
10 Best diamond testers of 2025
Save up to 19% off
- Best Choice
1
ValkynosValkynos Rechargeable Diamond Tester Pen with LCD Display & UV Light – Professional High Accuracy Gem & Jewelry Testing Tool for Diamonds, Easy-to-Use Electronic Selector for Novice and Expert
How do we rank?
- Value for Money
2
PresidiumPresidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones
3
PresidiumPresidium Multi Tester III (PMuT III) All-in-One Instrument for Testing Diamonds, Moissanites and Diamond Simulants
19% Off4
HMKISHMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier, Diamond Selector for Novice and Expert (Non-Rechargeable)
5
HqdzHigh Accuracy Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black)
-
See Today’s Deals & Prices
6
SizivikiDiamond Tester, Diamond Detector, High Accuracy Diamond Tester Pen for Professional Jewelers, Gem Tester (Metal Detection Limitation)
7
HqdzProfessional Rechargeable Diamond Tester Pen with UV Light,High Accuracy Jewelry Diamond Tester,Electronic Diamond Gem Tester and Tester Pen-Diamond Selector for Novice and Expert(Diamond Tester Pen)
8
PresidiumPRESIDIUM DIAMONDMATE-C ELECTRONIC DIAMOND TESTER
9
TEKCOPLUSDiamond Tester Jewelry Gem Stone Tester Kit – Professional 2-in-1 Tester for Diamonds, Moissanite, Metals, and Gemstones
10
HMKISDiamond Tester, Jewelry Diamond Tester Pen + 40X Mini LED Magnifying, Diamond Selector for Novice, Thermal Conductivity Meter