Can Moissanite Pass a Diamond Tester?

If you’ve ever Googled “moissanite vs diamond,” chances are you’ve come across questions like:
Can moissanite fool a diamond tester?
Will people know my ring isn’t a diamond?
Is moissanite fake if it doesn’t pass?

With so much information floating around, it’s time to clear things up. This guide explains how diamond testers work, whether moissanite passes the test, and what the results really mean.

What Is a Diamond Tester?

A diamond tester is a small handheld device used to determine if a stone is a genuine diamond—usually by testing thermal conductivity or electrical conductivity.

There are two types:

🔸 Thermal Conductivity Testers

• Detect heat transfer

• Diamonds disperse heat quickly

• Used in basic jeweller or retail setups

• Moissanite and diamond can often test the same here

🔸 Electrical Conductivity Testers

• Moissanite conducts electricity; diamonds do not

• More precise

• Used to differentiate moissanite from diamond in labs or high-end shops

💡 Modern testers often combine both methods for higher accuracy.

So... Can Moissanite Pass a Diamond Tester?

✅ Yes—on a thermal tester

Moissanite and diamond have very similar thermal properties, so most thermal testers will register moissanite as a diamond.

❌ No—on a combined (thermal + electrical) tester

Newer, advanced testers like the Presidium or Mizar can distinguish moissanite from diamond.

So the answer depends on which tester is being used.

Should You Be Concerned If Moissanite Doesn’t Pass?

Not at all.
Moissanite is not trying to be a diamond—it’s a gemstone in its own right.

It doesn’t “fail” a test—it simply identifies correctly as moissanite, which is:

• Lab-grown

• Durable

• Ethical

• Visually stunning

• Budget-friendly

Think of a tester like a barcode scanner. A banana doesn’t “fail” a scan because it’s not an apple—it’s just... a banana.

Why This Matters to Engagement Ring Buyers

You might be wondering:

“If someone tests my ring at a party or store, will they know it’s moissanite?”

Maybe—but that’s not a bad thing.

Most people:

• Can’t tell by eye

• Don’t carry testers

• Are impressed by the sparkle, not the label

• Respect ethical and thoughtful jewellery choices

Moissanite isn’t about passing for a diamond. It’s about choosing brilliance on your terms.

Is Moissanite a “Fake” Diamond?

Absolutely not.

Moissanite is:

• A genuine gemstone

• Not a simulant like cubic zirconia

• Recognised in its own category

• Cut and set in the same high-end ways as diamonds

It's real—just not carbon-based like diamond. And that’s perfectly okay.

Moissanite Ring Spotlight:

✨ Elysian Radiant Solitaire Ring
This radiant cut moissanite offers bold brilliance in a timeless setting, designed to sparkle from every angle—no matter what test it faces.

Final Thoughts: Choose Confidence, Not a Test Result

The only “test” that matters is how you feel when you wear your ring.

Moissanite might not always pass a high-end diamond tester—but it passes:

• The sparkle test

• The ethics test

• The value test

• The forever test

And that’s worth more than any beep from a handheld device.

Still Deciding Between Moissanite and Diamond?

Visit our Perth showroom or book an online consultation to compare stones side-by-side and build the engagement ring that feels right for you.

📍 Book Your Appointment with Diamond Lab