9 Best gemstone testers of 2025

Explore top picks

Best Choice

1

Presidium
Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones
Main highlights

Quick and Accurate Testing
The Presidium Gem Indicator offers fast results in under 6 seconds, ensuring accuracy with its retractable thermoelectric probe.

Ideal for Gem Enthusiasts
Perfect for identifying diamonds and 31 different gemstones, including rubies and sapphires.

Highly Praised for Versatility
Users appreciate its ability to test various gemstones and identify non-gem materials like glass.
Key specs
- Battery:USB port for power
- Dimensions:8.1 x 3.4 x 2.4 inches
- Testing Method:Handheld tester
- Weight:11.2 ounces
- Material:Chrome-brushed grip
9.8

Exceptional

Our Rating

8.0
Simple to use

8.0
worth the money

8.0
Precision
How do we rank?

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Based on millions of stores and reviews

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Value for Money

2

Presidium
Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones
Main highlights

Compact Design and Portability
Redesigned to be more compact, sturdy, and portable for easy use.

Ideal for Gemstone Identification
Perfect for identifying diamonds, moissanites, and common colored gemstones.

Reliable Performance
Praised for providing consistent and reliable results in gemstone testing.
9.7

Exceptional

Our Rating

8.2
Simple to use

8.0
Precision

8.0
worth the money
3

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

Quick and Easy Testing
Detects authenticity of diamonds, jade, agate, and crystal quickly.

Ideal for Jewelry Verification
Perfect for verifying gemstones in watches and jewelry.

Ease of Use Praised
Customers appreciate its simplicity and effectiveness in operation.
Key specs
- Battery:9V, not included
- Dimensions:5.31L x 0.87W x 1.57H
- Testing Method:Sound alert above 9
- Weight:3.52 ounces
- Material:Plastic
9.6

Exceptional

Our Rating

8.0
worth the money

8.0
Precision

8.0
Simple to use
4

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

High Accuracy Testing
The diamond tester provides reliable results, distinguishing diamonds from imitations with thermal conductivity.

Ideal for Novice and Expert
Suitable for both beginners and professionals in jewelry testing and inspection.

60X Magnification Praised
Customers appreciate the included 60X LED magnifier for detailed examination.
Key specs
- Battery:1 9V battery included
- Dimensions:10.16 x 2.17 x 1.38 inches
- Testing Method:Beeping sound alerts
- Weight:4.2 ounces
- Material:N/A
9.4

Excellent

Our Rating

8.9
movability

8.0
Simple to use

8.0
worth the money
5

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

Comprehensive Testing Kit
Includes tools for testing gold, silver, platinum, and diamonds.

Ideal for Jewelry Enthusiasts
Perfect for those investing in or evaluating precious metals and stones.

Highly Rated Diamond Tester
Customers praise the diamond tester for its accuracy and reliability.
Key specs
- Accuracy:Fast and accurate
- Karat Range:Gold, Silver, Platinum
- Test Types:Jewelry testing
- Power Source:N/A
- Portability:N/A
9.2

Excellent

Our Rating
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6

YZYOE
YZYOE Six LEDs Rechargeable Gemstone Flashlight Jade Appraisal Light, Super Bright Jewelry Diamond Detector Lamp.
Main highlights

Versatile Functionality
Six color modes for jewelry appraisal, stain detection, and counterfeit bill verification.

Ideal for Collectors
Perfect for antique collection, porcelain research, and gemstone inspection.

Durable Construction
Praised for its high-quality aluminum alloy build and durability.
Key specs
- Modes:Multiple lighting modes
- Charging:USB rechargeable
- Battery:1 Lithium Ion
- Material:Aluminum alloy
- Runtime:N/A
9.1

Excellent

Our Rating
7

Valkynos

Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection, Portable Gem Checker for Novice & Experts – Battery Included
8.8

Very Good

Our Rating
8

TEKCOPLUS

Chelsea Filter for Gemstone Identification Quickly Distinguish Genuine Emeralds, Rubies, Sapphires, Aquamarine Glass Filter, Reliable, Portable Ideal for Gemologists and Jewelers
8.6

Very Good

Our Rating
9

Hqdz-td

High Accuracy Diamond Tester,Jewelry Diamond Detector Gem Pen 30X 60X Illuminated Eye Loupe Mini Led Foldable Magnifying Jewelry Distinguish Tool and Tweezers
8.5

Good

Our Rating

9 Best gemstone testers of 2025

1

Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones

8.0

8.0

8.0

How do we rank?

How do we rank?

Analyzing top stores

2

Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones

8.2

8.0

8.0

3

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

8.0

8.0

8.0

4

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

8.9

8.0

8.0

5

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

6

YZYOE Six LEDs Rechargeable Gemstone Flashlight Jade Appraisal Light, Super Bright Jewelry Diamond Detector Lamp.

7

Valkynos Professional Diamond Tester Pen with 365nm UV Light & Thermal Sensor – Fast 0.5s Detection, Portable Gem Checker for Novice & Experts – Battery Included

8

Chelsea Filter for Gemstone Identification Quickly Distinguish Genuine Emeralds, Rubies, Sapphires, Aquamarine Glass Filter, Reliable, Portable Ideal for Gemologists and Jewelers

9

High Accuracy Diamond Tester,Jewelry Diamond Detector Gem Pen 30X 60X Illuminated Eye Loupe Mini Led Foldable Magnifying Jewelry Distinguish Tool and Tweezers

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