Diamonds · Lab Grown Diamonds ·

Do Lab Diamonds Pass A Diamond Tester

If you're thinking about choosing a lab-grown diamond, one of the first questions that might come to mind is: "Will it pass a diamond tester?" It's a great question — especially if you're comparing options or planning to create a custom engagement ring.

As the natural and lab grown diamond experts, at The Diamond Guys, we’re here to give you expert diamond guidance you can trust. Let’s walk through how diamond testers work, what they can detect, and what to expect when testing a lab-created diamond.

Will Lab-Grown Diamonds Pass a Diamond Tester?

Yes — lab-grown diamonds will pass a diamond tester. That’s because they are real diamonds.

Both lab-grown and natural-mined diamonds have the same chemical structure: pure carbon in a crystalline form. Since diamond testers measure thermal or electrical conductivity — and both diamond types conduct heat in the same way — testers will read them as genuine.

What Does a Diamond Tester Actually Measure?

Most diamond testers measure thermal conductivity, which is how fast heat moves through the stone. Some advanced models also test electrical conductivity — a helpful feature when trying to tell moissanite apart from a diamond.

But here's the key point: lab-grown diamonds behave the same way as natural diamonds under both tests, so a tester will not show any difference.

Can a Diamond Tester Tell if It’s Lab-Grown or Natural?

No, it can’t. A standard diamond tester will confirm that the stone is a diamond, but it won’t identify whether it was grown in a lab or mined from the earth.

  • To determine the origin, labs use highly specialized equipment such as:

  • Ultraviolet (UV) light spectroscopy

  • Infrared absorption analysis

  • Advanced fluorescence imaging

At The Diamond Guys, all our lab-grown diamonds come with a certified grading report and a laser inscription that clearly states the origin. It’s our way of ensuring full transparency.

What Happens if a Lab Diamond Doesn’t Register on a Tester?

Most of the time, a lab-grown diamond will pass without issue. But in rare cases, especially with older testers, some HPHT-grown diamonds may cause confusion due to tiny amounts of boron in the structure.

  • Other reasons a diamond might not test properly include:

  • Interference from the setting (especially in metal-heavy mountings)

  • Low battery or faulty tester

  • Improper contact with the probe

If there’s ever any doubt, our professionals can assist you with accurate, up-to-date testing at either of our showrooms in Scottsdale, AZ or Los Angeles, CA.

Are Lab-Grown Diamonds Real Diamonds?

Yes — and that’s important to understand. A lab-grown diamond is a real diamond, not a simulant like cubic zirconia or moissanite. It has the same brilliance, fire, durability, and structure as a mined diamond.

The difference lies only in the formation: one is created beneath the earth, and the other in a lab using advanced technology.

Can Jewelers Tell if a Diamond Is Lab-Grown?

Not by sight alone. Even trained jewelers cannot visually tell the difference between lab and natural diamonds without lab-grade equipment. That’s why certification and laser inscriptions are so important.

Every lab-grown diamond at The Diamond Guys is accompanied by a grading report from respected labs like GIA or IGI, giving you complete peace of mind.

Quick Answers to Common Related Questions 

Can Moissanite Pass a Diamond Tester?

Moissanite may pass a thermal conductivity test, but it will fail an electrical conductivity test. It is not a diamond.

Do All Lab-Grown Diamonds Test the Same?

Most do. Diamonds made using the CVD method test consistently well. HPHT diamonds may sometimes cause inconsistent results on older devices.

Should a Lab-Grown Diamond Be Removed From Its Setting for Testing?

In some cases, yes. While many diamond testers can be used on mounted stones, metal settings may interfere with the results. For the most accurate reading—especially with lab-grown diamonds—it’s best to test the stone loose or have it evaluated by a professional using advanced equipment, like our team at The Diamond Guys.

Why Choose Lab-Grown Diamonds From The Diamond Guys?

We believe in giving you choices. That’s why we offer a stunning variety of lab-grown and natural-mined diamonds — always with expert diamond guidance, fair pricing, and an easy, transparent process.

Our clients love the value, brilliance, and customization options that lab-grown diamonds provide, especially when designing custom engagement rings or heirloom-quality diamond jewelry.

At The Diamond Guys, you’ll enjoy:

  • A relaxed, welcoming showroom experience

  • Certified, hand-selected diamonds

  • One-on-one design consultations

  • Jewelry crafted in white gold, yellow gold, rose gold, or platinum

  • Personal service from real diamond experts

Conclusion: Diamond Testing Made Clear

Yes, lab-grown diamonds pass a diamond tester. Why? Because they are diamonds — with the same brilliance, structure, and lasting beauty you’d expect from a natural one.

Whether you're exploring diamond options, designing the perfect custom engagement ring, or simply looking to learn more, The Diamond Guys are here to help with clarity, honesty, and expert diamond guidance every step of the way.

Discover More With The Diamond Guys: Contact Us Today

  • Visit us in Scottsdale or Los Angeles

  • Explore our lab-grown diamond collection

  • Book your appointment for a personalized consultation

  • Call us in Scottsdale at 480-656-0652 or Los Angeles at 213-510-3555

  • Let’s create something unforgettable — together.

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