Professional Diamond Tester Pen Kit | High-Accuracy Selector

Identify Real Diamonds with Confidence

Whether you're a jeweler, gemologist, or jewelry enthusiast, this Professional Diamond Tester Pen Kit gives you fast, accurate results at your fingertips. Featuring both LED light and audio indicators, this compact selector helps you distinguish genuine diamonds from simulants in seconds — no guesswork, no lab required.

Key Features

• High-Accuracy Detection: Reliable thermal conductivity testing delivers consistent, trustworthy readings on stones of all sizes.
• Dual Indication System: Red LED light illuminates and an audio alert sounds when a genuine diamond is detected — making results impossible to miss.
• Simple Calibration: Easily adjustable for loose stones of various sizes with minimal setup.
• Includes Testing Platform: A dedicated platform for loose stones is included, keeping gems secure and steady during testing.
• Lightweight & Portable: Slim pen-style body fits comfortably in hand; comes with a convenient carrying case for on-the-go use.
• Detailed User Manual: Step-by-step instructions included so you can get started right away.

Specifications

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

Package Includes

• 1 × Diamond Selector Tester Pen
• 1 × Testing Platform (for loose stones)
• 1 × Carrying Case
• 1 × User Manual

Care & Maintenance Tips

• Handle the probe tip with care — it is highly sensitive. Always replace the protective sheath when not in use.
• If the indicator light appears dim, the battery is low — replace promptly for accurate readings.
• Remove the battery if storing for an extended period.
• For best accuracy, calibrate the device approximately once per year.

Made in Mainland China.

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Trusted Gemological Resources

For more information on gem identification and quality standards, visit the NIST Measurement & Calibration Resource — a reliable reference for instrument calibration and measurement standards.

Frequently Asked Questions

Q: How does the diamond tester pen work?

A: This diamond tester pen uses thermal conductivity technology. Real diamonds conduct heat differently than simulants such as cubic zirconia or moissanite. When the probe tip is pressed gently against a stone, the device measures heat transfer and indicates the result via a red LED light and an audio beep if a genuine diamond is detected.

Q: Does the diamond tester pen work on loose stones?

A: Yes! The kit includes a dedicated testing platform specifically designed for loose stones, holding them securely in place so you can get a clean, accurate reading without the stone slipping.

Q: What battery does the diamond tester use?

A: The device requires one standard 9V DC battery, which is not included in the package. Standard 9V batteries are widely available at most electronics or hardware stores.

Q: Is this diamond tester suitable for professional use?

A: Absolutely. This tester is designed for both professional jewelers and hobbyists. Its high-accuracy readings, simple calibration, and portable form factor make it a practical tool for gem identification in a shop, at a market, or at home.