Does Moissanite Pass a Diamond Tester?

Does Moissanite Pass a Diamond Tester?

One of the most common questions surrounding moissanite is simple — and important:
Does moissanite pass a diamond tester?

The short answer is yes.
The long answer explains why, and more importantly, what a diamond tester actually measures.

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What Does a Diamond Tester Measure?

Most standard diamond testers do not identify whether a stone is a diamond by origin. Instead, they measure thermal conductivity — how efficiently heat travels through a gemstone.

Diamonds conduct heat extremely well, which is why they respond positively on thermal testers. However, thermal conductivity alone is not unique to diamonds.

Moissanite also has very high thermal conductivity, meaning it reacts in the same way on most traditional diamond testers.

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Why Moissanite Passes a Diamond Tester

Moissanite’s crystal structure allows heat to travel rapidly through the stone — similar to diamond. As a result:

• Standard thermal diamond testers will typically read moissanite as diamond

• This is not an error — it is a limitation of the testing method

Because of this, moissanite is one of the very few gemstones that consistently passes diamond testers.

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Diamond Tester vs Moissanite Tester

To distinguish between diamond and moissanite, a dual tester is required. These advanced testers measure both:

• Thermal conductivity

• Electrical conductivity

Diamonds and moissanite differ in electrical conductivity, allowing specialized testers to tell them apart accurately.

In professional gemology, additional methods such as magnification, birefringence analysis, and spectroscopy are also used.

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What This Means for Buyers

The fact that moissanite passes a diamond tester does not mean it is misrepresented or deceptive. It means that moissanite shares key physical properties with diamond — particularly those related to performance.

In everyday settings, including jewelry stores, resale environments, and casual testing, moissanite often registers as diamond.

This reinforces a key point: moissanite is not a low-grade imitation, but a high-performance gemstone with diamond-like properties.

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Is This a Problem?

No — unless clarity and transparency are compromised.

Reputable jewelers clearly disclose moissanite as moissanite. Passing a diamond tester is not about pretending to be something else; it is about measurable material performance.

At JUVÉ, all moissanite stones are:

• Clearly disclosed

• Diamond tester approved

• Accompanied by official GRA certification

Transparency matters as much as performance.

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A Modern Reality

Diamond testers were designed decades ago for a simpler market. Today’s gemstones are more advanced, and moissanite is a clear example of how technology has evolved beyond traditional assumptions.

If a gemstone passes a diamond tester, it means it performs at a high physical level — not that it relies on illusion.

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The Takeaway

Yes, moissanite passes a diamond tester.
And the reason it does is the same reason it has become one of the most respected alternatives in modern fine jewelry: performance, durability, and precision.

Understanding how testing works allows buyers to make informed decisions — without myths or confusion.