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9 Best diamond testers of 2025

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  • Best Choice

    1

    Valkynos 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
    Valkynos

    Valkynos 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

    9.8
    Exceptional
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  • Value for Money

    2

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

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

    15% Off
    9.7
    Exceptional
    Our Rating

  • 3

    PRESIDIUM DIAMONDMATE-C ELECTRONIC DIAMOND TESTER
    Presidium

    PRESIDIUM DIAMONDMATE-C ELECTRONIC DIAMOND TESTER

    9.5
    Excellent
    Our Rating

  • 4

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

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

    • Battery:1 9V battery included
    • Dimensions:10.16 x 2.17 x 1.38 inches
    • Testing Method:Beeping sound alerts
    • Sound Alert:Beeping-beeping-beeping
    • Weight:4.2 ounces
    9.3
    Excellent
    Our Rating

  • 5

    High Accuracy Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black)
    Hqdz

    High Accuracy Professional Diamond Tester Pen Jeweler Tool for Novice and Expert - Diamond Selector II 9V Battery Included(Black)

    9.2
    Excellent
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  • 6

    Diamond Tester, Professional Jewelers' Gemstone Detector, High Accuracy Diamond Tester Pen Professional (Metal Detection Limitation)
    Siziviki

    Diamond Tester, Professional Jewelers' Gemstone Detector, High Accuracy Diamond Tester Pen Professional (Metal Detection Limitation)

    • Battery:9V, not included
    • Dimensions:5.31L x 0.87W x 1.57H
    • Testing Method:Sound alert above 9
    • Sound Alert:Yes
    • Weight:3.52 ounces
    9.1
    Excellent
    Our Rating

  • 7

    Diamond Tester Professional Diamond Tester Pen with UV Light, Jewelry Gem Tester Pen，Portable Electronic Diamond Checker Tool，Professional Diamond Selector for Novice and Expert（Battery Included）
    Hqdz-td

    Diamond Tester Professional Diamond Tester Pen with UV Light, Jewelry Gem Tester Pen，Portable Electronic Diamond Checker Tool，Professional Diamond Selector for Novice and Expert（Battery Included）

    • Battery:1 9V battery
    • Dimensions:5 x 1.18 x 0.8 inches
    • Testing Method:High-tech chip
    • Sound Alert:Buzzer emits rings
    • Weight:3 ounces
    8.8
    Very Good

  • 8

    Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE
    GTE

    Purity Testing Kit for Diamonds Gemstones Moissanites Gold Silver and Platinum Jewelry Electronic Digital Diamond Tester Machine JSP GTE

    • Accuracy:Fast and accurate
    • Karat Range:Gold, Silver, Platinum
    • Test Types:Jewelry testing
    • Power Source:N/A
    • Portability:N/A
    8.6
    Very Good

  • 9

    High Accuracy Professional Diamond Tester Pen, Jewelry Diamond Tester with 60X Mini LED Magnifying&40X Full Metal Illuminated Jewelry Loop Magnifier,Diamond Selector for Novice and Expert
    Hqdz-td

    High Accuracy Professional Diamond Tester Pen, Jewelry Diamond Tester with 60X Mini LED Magnifying&40X Full Metal Illuminated Jewelry Loop Magnifier,Diamond Selector for Novice and Expert

    • Battery:1 9V battery included
    • Dimensions:7 x 1 x 1.5 inches
    • Testing Method:Thermal conductivity
    • Sound Alert:Beeping sound
    • Weight:4.2 ounces
    8.4
    Good