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10 Best gem testers of 2026
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Best Choice1
Clicked 133 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)
15% 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
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
9.3Excellent
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5
HMKISHMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier, Diamond Selector for Novice and Expert (Non-Rechargeable)
12% 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
9.1Excellent
Our Rating
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6
TEKCOPLUSHeavy Duty Calcite Dichroscope Gemstone Tester Trichoic Pleochroic Colors Gemstone Identification Gemstones Gemological Testing Diamond Jeweler Tool Metal Body Gemology
Key specs-
weight:1.44 ounces
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dimensions:3.23 x 1.26 x 1.22 inches
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magnification:N/A
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lens material:N/A
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handle material:N/A
8.8Very Good
Our Rating
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7
HqdzDiamond Tester Pen,Jewelry Diamond Tester Pen+30X 60X Mini LED Magnifying Jewelry Eye Loupe Jewelry Distinguish Tool Professional Diamond Selector for Novice and Expert
8.6Very Good
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8
GemtoneGemtone All-in-One Gold, Silver, Platinum & Diamond Jewelry Testing and Appraisal Kit with Solutions, Digital Scale, Diamond Tester, Touchstone, and Accessories
8.4Good
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9
Hqdz-tdDiamond Tester,Jewelry Diamond Tester Pen+200g/0.01g Mini Jewelry Scale＋60X Mini LED Magnifying, Professional Diamond Selector for Novice and Expert,Thermal Conductivity Meter(Diamond Tester +)
8.1Good
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10
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）
8.0Good
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