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10 Best gem stone testers of 2026
Save up to 23% off
Best Choice1
Clicked 121 times in the last monthPresidiumPresidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones
9.9Exceptional
Our Rating
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Value for Money2
SmartProSmartPro SPGE-I Gem Eye I Gem and Diamond Tester Smart Pro
9.6Exceptional
Our Rating
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3
SizivikiDiamond Tester, Professional Jewelers' Gemstone Detector, High Accuracy Diamond Checker Pen Professional for Jewelers, Gem Tester (Jewelry-Only Detection)
23% OffKey specs-
Battery:9V, not included
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Dimensions:5.31L x 0.87W x 1.57H
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Testing Method:Sound alert above 9
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Sound Alert:Yes
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Weight:3.52 ounces
9.5Excellent
Our Rating
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4
HMKISHMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier, Diamond Selector for Novice and Expert (Non-Rechargeable)
19% OffKey specs-
Battery:1 9V battery included
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Dimensions:10.16 x 2.17 x 1.38 inches
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Testing Method:Beeping sound alerts
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Sound Alert:Beeping-beeping-beeping
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Weight:4.2 ounces
9.3Excellent
Our Rating
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5
GTEPurity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE
Key specs-
Accuracy:Fast and accurate
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Karat Range:Gold, Silver, Platinum
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Test Types:Jewelry testing
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Power Source:N/A
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Portability:N/A
9.1Excellent
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6
GemtoneGemtone All-in-One Gold, Silver, Platinum & Diamond Jewelry Testing and Appraisal Kit with Solutions, Digital Scale, Diamond Tester, Touchstone, and Accessories
8.9Very Good
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7
ValkynosValkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection, Portable Gem Checker for Novice & Experts – Battery Included
8.6Very Good
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8
ValkynosValkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection, Portable Gem Checker for Novice & Experts – Battery Included
8.3Good
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9
UVERDiamond Tester Professional Diamond Tester Pen with UV Light, 60X Mini LED Magnifying, Jewelry Gem Tester Pen, Professional Diamond for Novice and Expert（Battery Included）
8.2Good
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10
HqdzDiamond Tester,High Accuracy Jewelry Diamond Tester Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black Diamond Testers)
8.1Good
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