Does Moissanite Pass the Diamond Tester? The Truth You Need to Know

If you're buying moissanite and someone pulls out a diamond tester… will it pass?

It's a common question and one that causes a lot of confusion (and even scams) in the jewelry world. In this post, we’ll break down the real answer so you can shop confidently and avoid getting ripped off.

 

What Is a Diamond Tester and How Does It Work?

Most traditional diamond testers check thermal conductivity. Diamonds conduct heat very well, so when the tester touches the stone and detects heat transfer, it signals that the stone is a diamond.

But here’s the problem: Moissanite also conducts heat extremely well. So on a standard thermal diamond tester, moissanite will often register as a diamond even though it's a different gemstone entirely.

Can Moissanite Pass a Diamond Tester?

Yes, moissanite can pass basic diamond testers. That’s because these devices are only measuring thermal conductivity, and moissanite and diamond are nearly identical in that regard.

However, moissanite will not pass a dual tester — one that checks both thermal and electrical conductivity. Diamonds conduct electricity; moissanite does not. That’s where the truth gets revealed.

How Scammers Use This to Their Advantage

Some unethical sellers exploit this fact. They use a cheap diamond tester to "prove" their stone is a diamond, knowing it’s actually moissanite.

This trick has fooled countless buyers into paying diamond-level prices for a stone that isn’t a diamond. Moissanite is beautiful and valuable — but it should never be sold as a diamond.

How to Tell the Difference Between Moissanite and Diamond

Here are three reliable ways to identify whether a stone is moissanite or diamond:

1. Use a Dual Diamond Tester

Dual testers measure both thermal and electrical conductivity. A real diamond will pass both. Moissanite will fail the electrical portion.

2. Examine Under Magnification

Moissanite often shows double refraction, which you can spot under a 10x jeweler’s loupe. Diamonds will not.

3. Compare the Price

Diamonds are significantly more expensive. If a stone is labeled as a diamond but the price seems too good to be true, it probably is.

Is Moissanite Worth Buying?

Absolutely, if you know what you're buying.

Moissanite is:

• One of the most brilliant gemstones available
• Extremely durable (9.25 on the Mohs hardness scale)
• Lab-created, ethical, and conflict-free
• A fraction of the price of a diamond

It's not a fake diamond, it's a smart alternative. But you should never be misled into thinking it's something it's not.

Why We’re Transparent About Our Stones

At Huerta Jewelry, we don’t play games. Every product we sell is clearly labeled whether it’s diamond, moissanite, or CZ. No confusion. No hidden surprises. Just transparency, honesty, and real value.

Final Thoughts

Moissanite can pass a diamond tester but that doesn’t make it a diamond. Knowing how these tools work, and how to verify what you’re buying, will protect you from scams and help you make informed decisions.

If you want moissanite that’s real, beautiful, and honestly represented, shop our Moissanite collection .