How does a diamond tester pen work?

The Diamond Tester Pen uses a highly sensitive thermoelectric probe to measure the thermal conductivity of gemstones. Diamonds are excellent heat conductors, and the pen detects how quickly heat is drawn away from the stone. This information is then translated into clear visual and audible indicators to help determine if a stone is a genuine diamond or a simulant. For a more in-depth understanding, check out our guide to using a diamond tester pen.

What is the Diamond Tester Pen used for?

The Diamond Tester Pen is designed for anyone looking to verify the authenticity of gemstones. It's ideal for jewelry buyers, collectors, online shoppers, pawn shop owners, and small-scale jewelers. It helps ensure you are getting what you pay for and protects your valuable investments.

Can this diamond tester distinguish moissanite from diamond?

Yes, the Diamond Tester Pen is engineered to differentiate genuine diamonds from common simulants like moissanite and cubic zirconia. Diamonds have unique thermal properties that the pen can detect, providing accurate readings.

How do I use the Diamond Tester Pen?

Using the Diamond Tester Pen is straightforward. First, turn on the device and allow it to warm up. Then, gently touch the probe tip perpendicularly to the flat surface of the stone you are testing, ensuring you don't touch the metal setting. Observe the LED lights and listen for audible signals to interpret the results. A continuous beep and specific light patterns typically indicate a diamond. For detailed instructions, please refer to the product manual or our guide on how to test a diamond.

What is the metal alert system for?

The integrated metal alert system is a crucial safety feature. It warns you if the probe accidentally touches the metal setting of a piece of jewelry. This prevents false positive readings, ensuring that only the stone itself is being tested for accuracy.

Is the Diamond Tester Pen portable?

Yes, the Diamond Tester Pen features a compact and portable design, making it easy to carry in your pocket or a small bag. This makes it convenient for on-the-go inspections at markets, estate sales, or while traveling.

How do I care for my Diamond Tester Pen?

To ensure the longevity and accuracy of your Diamond Tester Pen, always replace the protective cap over the probe tip when not in use. Store the tester safely in its original case or a padded container. If not using the device for an extended period, remove the batteries to prevent leakage. Periodically wipe the body with a soft, dry cloth, avoiding harsh chemicals.

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

Name: Diamond Selector 2 Tester Pen - London, United Kingdom
Brand: ZEYANA United Kingdom
SKU: 1095e642-5ea8-4b52-8473-940b66ffbf1c
Price: 17.00 GBP
Availability: InStock
Rating: 4.7 (10 reviews)
Author: Rasmus Granquist

(10)

EUR 20.00

The Zeyana Standard

Conscious Origins

Every stone is cultivated in a certified laboratory, ensuring zero environmental impact and full supply chain transparency.

Material Integrity

Each piece is cast in solid 925 sterling silver, rhodium-plated to provide a durable, tarnish-resistant finish suitable for daily wear.

Provenance

Every item arrives in our signature protective casing, accompanied by a certificate of authenticity detailing your stone’s specific grading.

Universal Delivery

We provide global shipping and a 180-day return policy, ensuring your purchase is held to our standards from departure to delivery.

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

(10)

EUR 20.00

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

(10)

EUR 20.00

Written by Rasmus Granquist

GenderMale

ColorBlack

Age groupAdult

BrandZeyana

ModelDiamond Selector 2

Dimensions159 x 39 x 20mm (6.26 x 1.53 x 0.78in)

Product Weight62g

Battery Type1x 9V Battery

Battery Life~3 hours

Low Battery WarningYes

LED DisplayYes

Audible Test ResultsYes

FAQ

The Zeyana Standard

Conscious Origins

Every stone is cultivated in a certified laboratory, ensuring zero environmental impact and full supply chain transparency.

Material Integrity

Each piece is cast in solid 925 sterling silver, rhodium-plated to provide a durable, tarnish-resistant finish suitable for daily wear.

Provenance

Every item arrives in our signature protective casing, accompanied by a certificate of authenticity detailing your stone’s specific grading.

Universal Delivery

We provide global shipping and a 180-day return policy, ensuring your purchase is held to our standards from departure to delivery.

Customer Reviews

10 Reviews

Anonymous

Feb 14, 2026

Works

Tested all my jewelry. works good. beeps for diamond.

Anonymous

Feb 6, 2026

Useful

Bought to check some estate jewelry. saved me some money. simple to use.

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Alina

3.5CTW Emerald Cut Moissanite Silver Eternity Ring

EUR 230.00→

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

(10)

EUR 20.00

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

The Zeyana Standard

Conscious Origins

Material Integrity

Provenance

Universal Delivery

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

About Diamond Selector 2 Tester Pen

Jewellery Details

FAQ

The Zeyana Standard

Conscious Origins

Material Integrity

Provenance

Universal Delivery

Customer Reviews

Works

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Alina

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

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Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

The Zeyana Standard

Conscious Origins

Material Integrity

Provenance

Universal Delivery

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

Cookies and your privacy

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

About Diamond Selector 2 Tester Pen

Jewellery Details

FAQ

The Zeyana Standard

Conscious Origins

Material Integrity

Provenance

Universal Delivery

Customer Reviews

Works

Useful

You Might Also Like

Alina

Alina

Diamond Selector 2 Tester Pen - Handheld thermal conductivity tester

About Diamond Selector 2 Tester Pen

Jewellery Details

FAQ

Customer Reviews

Works

Useful

You Might Also Like

The Evora Ring

The Evora Ring

Arabella

Arabella

The Calira Hoop Earrings

The Calira Hoop Earrings

The Aylin Necklace

The Aylin Necklace

Isla

Isla

Alina

Alina

The Evora Ring

The Evora Ring

Arabella

Arabella

The Calira Hoop Earrings

The Calira Hoop Earrings

The Aylin Necklace

The Aylin Necklace

Isla

Isla