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10 Best Diamond Testers
2026 in the US

Handpicked from luxury brands
#1
Editor's choice
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1,339 verified reviewsPresidiumPresidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones
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Key Features

  • 1.

    Assisted Thermal Calibration: Enables easy self-calibration to adapt to the testing environment, ensuring accurate results.

#2
Customer favorite
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18 verified reviewsPresidiumSAM by Presidium, Diamond Tester and Identify a Wider Range of Moissanites
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Key Features

  • 1.

    Carat Size Range: Tests carat size from 0.01 to 10 carats

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#3
Signature pick
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58 verified reviewsPresidiumPresidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones
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Key Features

  • 1.

    Fast Gemstone Testing: Delivers results in less than 6 seconds for colored gemstones.

#4
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8,153 verified reviewsHMKISHMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier, Diamond Selector for Novice and Expert (Non-Rechargeable)
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Key Features

  • 1.

    Dual Power Supply: USB Type-C and 9V battery options for flexibility.

#5
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202 verified reviewsPresidiumPRESIDIUM DIAMONDMATE-C ELECTRONIC DIAMOND TESTER
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130 verified reviewsPresidiumPDMT-A Diamond Mate Electronic Tester A
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Key Features

  • 1.

    Low Power Usage: Ensures efficient operation, conserving energy and reducing costs.

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24 verified reviewsTEKCOPLUSDiamond Tester Jewelry Gem Stone Tester Kit – Professional 2-in-1 Tester for Diamonds, Moissanite, Metals, and Gemstones
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Key Features

  • 1.

    Integrated Metal Detector: Helps locate and eliminate undesired metals or rubbish

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7,412 verified reviewsHqdzDiamond 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)
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Key Features

  • 1.

    Fast and Safe Testing: Quickly and accurately distinguishes genuine diamonds from fakes with safety in mind.

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3 verified reviewsDiamondNite Dual Tester Jewelry tool
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216 verified reviewsHqdz-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 +)
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Key Features

  • 1.

    Accurate Diamond Testing: Detects real diamonds and Moissanite with LED and audio indicators