How Do Lab-Grown Diamond Testers Work?

Every so often, a customer leans over the counter, their diamond catching the light, and asks with genuine curiosity:

“So… can you actually tell if it’s lab grown?”

It’s one of our favorite questions. Because while the sparkle looks identical, the way jewelers uncover a diamond’s story is pure science — and a little bit of art.

What a Diamond Tester Really Does

A diamond tester isn’t judging sparkle or quality.

It simply asks one question: “What is this made of?”

Traditional testers measure how heat or electricity travels through a gem. Diamonds conduct heat differently than other stones — that’s how jewelers once confirmed if a stone was real.

But that was before lab grown diamonds entered the story.

Why Lab Grown Diamonds Changed Everything

Lab grown diamonds are made of the same thing as mined ones: pure carbon, arranged in the same crystal pattern.

They look the same, feel the same, and even test the same on older machines.

A traditional tester will call both ‘diamond’ — because they are. It’s just that one grew deep beneath the earth, and the other grew under controlled brilliance in a lab.

That’s why today’s jewelers use more advanced technology — tools that can read the diamond’s “fingerprint.”

The Science of a Modern Diamond Tester

Modern testers don’t rely on heat anymore — they rely on light.

Here’s how it works:

• Light and Energy: The tester sends light through the diamond and measures how it reacts.

• Growth Patterns: Every diamond — lab or natural — has unique atomic lines. Machines can spot the difference in how those lines formed.

• Fluorescence: Some lab grown diamonds glow differently under UV light. It’s subtle, but it’s there.

Think of it as the diamond whispering its origin through light — and the tester simply translating it.

What We Use at Nazar’s & Co. Jewelers

In our showroom, we use GIA-certified instruments that combine light and conductivity testing. They don’t just verify that a diamond is real — they help us understand how it came to life.

Because whether it was formed beneath the earth or crafted in a lab, we believe every diamond deserves to be understood and celebrated.

What Testers Don’t Tell You

A diamond tester won’t tell you if your diamond is beautiful, valuable, or full of meaning.

Both lab grown and natural diamonds are real — just born in different places.

So, when we test a diamond, what we’re really doing is learning its origin story, not its worth.

Why It Matters

Understanding where your diamond came from adds another layer of connection.

It’s part science, part storytelling — and part of what makes the jewelry experience so personal.

At Nazar’s & Co. Jewelers, we make sure every diamond, whether natural or lab grown, is certified and verified, so you always know its true character.

The Nazar’s & Co. Touch

When you bring a diamond to us, we treat it with care — whether it’s an heirloom or a brand-new engagement ring.

Our gemologists handle each piece like a story waiting to be told, using precision instruments and decades of expertise.

And when we hand it back to you, we do it with the same smile we started with — because the magic isn’t in the machine.

It’s in the meaning.

The Final Reflection

So, how do lab grown diamond testers work?

They listen to the stone’s quiet signals — the way it holds light, conducts energy, and reveals its past.

Whether your diamond was born in the depths of the earth or crafted by human innovation, its beauty remains the same.

Discover your diamond’s story with us at Nazar’s & Co. Jewelers

Because every sparkle deserves to be understood — and celebrated.