High Accuracy Diamond Tester Pen & Selector Kit | Pro Use

Instantly Identify Real Diamonds with Professional Accuracy

The High Accuracy Diamond Tester Pen & Selector Kit is the go-to tool for jewelers, gemologists, collectors, and anyone who wants to quickly verify the authenticity of diamonds and gemstones. Whether you're buying loose stones, checking estate jewelry, or working at a jeweler's bench, this compact and easy-to-use tester delivers fast, reliable results every time.

Why You'll Love It

• Instant LED & Audio Feedback: A red LED light illuminates and an audio alert sounds the moment a real diamond is detected — no guesswork needed.
• High-Precision Probe Tip: Engineered for accurate and repeatable readings across diamonds of various shapes and sizes.
• Simple One-Button Operation: Minimal learning curve — just calibrate, touch the probe to the stone, and read the result.
• Versatile Calibration: Easily adjustable for loose stones and mounted gems alike.
• Portable Design: Lightweight ABS body (14 × 4 × 2 cm) fits in your pocket or tool roll with ease.
• Complete Kit: Comes with a dedicated testing platform for loose stones, a protective carrying case, and a detailed user manual — everything you need right out of the box.

Specifications

• Color: Black
• Body Material: ABS Plastic
• Power: 1 × 9V DC Battery (not included)
• Item Size: 14 × 4 × 2 cm (5.5 × 1.6 × 0.8 in)

Package Includes

• 1 × Diamond Selector Tester Pen
• 1 × Loose Stone Testing Platform
• 1 × Protective Carrying Case
• 1 × User Manual

Care & Maintenance Tips

• Always replace the probe sheath when not in use — the tip is precision-sensitive.
• Replace the 9V battery promptly when the indicator light dims.
• Remove the battery if storing the unit for an extended period.
• For best accuracy, recalibrate the device approximately once per year.

Made in Mainland China.

For more information on gem and jewelry standards, visit the FTC's Jewelry Buying Guide for consumer tips on verifying precious stones.

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Frequently Asked Questions

Q: What does the diamond tester pen actually detect?

A: The diamond tester pen measures thermal conductivity to distinguish real diamonds from cubic zirconia, glass, and most simulants. When the probe contacts a genuine diamond, the LED indicator lights up red and an audio alert sounds, confirming the stone's authenticity.

Q: Does the diamond tester kit work on mounted stones as well as loose gems?

A: Yes! The kit is designed for both loose stones (using the included testing platform) and stones that are already mounted in jewelry settings, making it versatile for bench jewelers and collectors alike.

Q: Is a battery included with the diamond selector kit?

A: No, the kit requires one standard 9V DC battery, which is not included. Most hardware and grocery stores carry 9V batteries, so you can be up and running very quickly after purchase.

Q: How accurate is this diamond tester pen?

A: This professional-grade diamond selector offers high accuracy for distinguishing diamonds from common simulants. For best results, calibrate before each session and follow the maintenance guidelines in the included user manual.