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9 Best diamond tester professional pens of 2025
Explore top picks
Best Choice1
Hqdz-tdDiamond 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）
Key specs-
Battery:1 9V battery
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Dimensions:5 x 1.18 x 0.8 inches
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Testing Method:High-tech chip
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Sound Alert:Buzzer emits rings
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Weight:3 ounces
9.6Exceptional
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Value for Money2
ValkynosValkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection, Portable Gem Checker for Novice & Experts – Battery Included
9.3Excellent
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3
SizivikiDiamond Tester, Professional Jewelers' Gemstone Detector, High Accuracy Diamond Tester Pen Professional (Metal Detection Limitation)
Key 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
9.2Excellent
Our Rating
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4
Hqdz-tdHigh 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
Key specs-
Battery:1 9V battery included
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Dimensions:7 x 1 x 1.5 inches
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Testing Method:Thermal conductivity
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Sound Alert:Beeping sound
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Weight:4.2 ounces
9.0Excellent
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5
HMKISDiamond Tester Pen, Professional Jewelry Diamond Selector Diamond Selector for Novice and Expert (Non-Rechargeable)
8.9Very Good
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6
HMKISHMKIS Diamond Tester Pen, Professional Jewelry Diamond Tester with 60X Jewelry Loupe Magnifier, Diamond Selector for Novice and Expert (Non-Rechargeable)
8.7Very Good
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7
xinlerXinler Accuracy Jewelry-Diamond Tester Pen Professional Jewelry Diamond Tester Tool
Key specs-
Battery:1x 9V battery
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Dimensions:16 x 4 x 2.2 cm
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Testing Method:Lights and beeps
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Sound Alert:Beeps
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Weight:100g
8.5Good
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8
Hqdz-tdDiamond Tester High Accuracy Diamond Tester Pen,Environmental Protection 9V Battery,Professional Diamond Selector for Jeweler Novice and Expert,Thermal Conductivity Meter (Diamond Tester)
8.3Good
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9
Hqdz-tdProfessional Diamond Tester Pen, High Accuracy Jewelry Diamond Tester, Electronic Diamond Gem Tester and Tester Pen 60X Magnifying Glasses Tool Kit for Novice Expert (Diamond Tester Pen)
8.1Good
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