Is moissanite real, or is the stone you are holding a fake? Moissanite is a real gemstone, but lookalikes sold under its name do exist. This guide shows how to tell if moissanite is real with seven tests, starting with the quickest. If you are still shopping, the red flags and certificate sections below cover what to check before you pay.
Moissanite is a genuine lab-grown stone. The fakes sold under its name are usually cubic zirconia, glass, or white sapphire.
One test rarely settles the question, so combine several checks before you decide.
The electrical tester, the certificate check, and a jeweler's test are the most dependable methods.
Fire is a clue rather than proof, so pair it with an electrical or loupe check.
Clarity alone cannot prove a stone is real, so check the grades printed on its certificate.
Only a report whose number matches the girdle inscription counts as strong evidence.
Is Moissanite Real or Fake?
Moissanite is real. It is a lab-grown gemstone made of silicon carbide, with its own optical and physical properties. When people ask “is moissanite fake”, they usually mean a lookalike. Fake moissanite is cubic zirconia, glass, or white sapphire sold as moissanite, and it can be told apart with simple tests.
What Fake Moissanite Usually Is
Most fakes sold as moissanite are cubic zirconia (CZ), glass, or white sapphire. The table compares real moissanite with diamond and CZ on refractive index, fire, density, and hardness on the Mohs scale. CZ is the most common fake, and it is far heavier and much less fiery. Glass is softer and scratches easily. White sapphire is hard but has much less fire.
| Stone | Refractive index | Fire (dispersion) | Hardness (Mohs) | Density (g/cm3) |
|---|---|---|---|---|
| Moissanite | 2.65 to 2.69 | 0.104 | 9.25 | 3.21 |
| Diamond | 2.42 | 0.044 | 10 | 3.52 |
| Cubic zirconia (CZ) | 2.15 to 2.18 | about 0.060 | 8 to 8.5 | 5.6 to 6.0 |
7 Ways to Tell if Moissanite Is Real
No single test is final, so run as many as you can. Here’s how to tell if a moissanite is real. Also, you’ll know how to test if moissanite is real without a lab. Tests 2 to 5 show how to spot fake moissanite at home, while tests 1, 6, and 7 are the most reliable overall.
1. Use a Moissanite Tester
A moissanite tester checks electrical conductivity. Moissanite conducts electricity, while CZ and glass do not, so this test separates real moissanite from most fakes in seconds. A standard diamond thermal tester is the wrong tool for this job. Moissanite conducts heat almost like diamond, so a thermal tester reads it as diamond. Use an electrical moissanite tester or a multi-tester that checks both.
2. Look for Doubling Under a 10x Loupe
Moissanite is doubly refractive, so light splits into two paths inside the stone. Hold a 10x loupe over the stone and look through the top at the back facet edges. In real moissanite, those edges look doubled or blurry, and you may need to tilt the stone to see it. Diamond, CZ, and glass show single, sharp edges.
3. Check the Rainbow Fire
Fire is the colored flash a stone throws in bright light. Moissanite has a dispersion of 0.104, more than twice a diamond's 0.044. Under a lamp or in sunlight, real moissanite flashes strong rainbow colors. CZ throws a weaker color, and glass looks flat by comparison. Treat fire as a clue, not proof, and pair it with test 1 or 2.
4. Try the Fog Test
Clean the stone first, since oils change the result. Then breathe on it as you would on a mirror. Fog clears almost instantly from real moissanite because it moves heat quickly. On CZ or glass, the fog hangs on for a few seconds longer.
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5. Compare the Weight
At the same size, CZ is far heavier than moissanite. CZ has a density of 5.6 to 6.0, while moissanite has a density of 3.21. Weigh a loose stone and compare it with a moissanite of the same diameter. A stone that weighs much more than expected is likely CZ.
6. Check the GRA Report and Girdle Inscription
Many moissanite sellers include a certificate such as a GRA report. Check that the weight, size, and grades on the certificate match the stone. Then use a loupe to look for a tiny laser inscription on the girdle that matches the report number. A matching report and inscription are strong evidence. A paper report with no inscription is not.
7. Ask a Jeweler to Test It
Any qualified jeweler or gemologist with a moissanite tester can identify moissanite and check for doubling, usually in minutes. How do I know if my moissanite is real when it has no certificate? This is the best answer. A professional gemstone appraisal can document the result in writing. For highly accurate results, advanced laboratory methods like Raman spectroscopy can be employed. These techniques provide detailed insights into the gemstone's chemical composition and structure.
Does Moissanite Look Fake?
Real moissanite can look fake to anyone expecting a diamond. It throws stronger rainbow flashes than a diamond, and some stones show a faint yellow or green tint in certain light. That is normal for moissanite, not a sign of a fake.
Our guide on whether moissanite looks fake explains why. A clean stone proves nothing, since CZ and glass are usually clean too, so check the clarity and color grade on the certificate instead.
Red Flags When Buying Moissanite
Before you pay, watch for these warning signs:
No certificate: A reputable seller provides a certificate that matches the stone. Ask for the report number.
A price far below market: Moissanite costs less than diamond, but a price that is too low can point to CZ or glass. Compare prices from several sellers.
Vague descriptions: Look for the stone's origin, size, color grade, and clarity grade. Honest listings include all of them.
Unclear returns or warranty: Read the return policy and any warranty terms before you buy.
Thin reviews: Check independent reviews and the seller's track record, and stick to reputable sellers.
Plain packaging: Legitimate brands ship pieces in branded packaging with the certificate inside.
Read more about Why is Moissanite so Cheap? The secret of Diamond Twin.
Read the ArticleConclusion
So, is moissanite real? Yes, and you can confirm it. Use a moissanite tester, check for doubling under a loupe, and ask for a certificate that matches the stone. If you are buying, avoid sellers who cannot show one.
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FAQs
Is moissanite a fake diamond?
No. Moissanite is a distinct stone made of silicon carbide rather than carbon. Is moissanite considered fake? It is not a fake gemstone. It is genuine moissanite as long as stores label the item properly. It only becomes fake if a seller falsely claims the stone is a real diamond. Still skeptical? Read whether moissanite is just a marketing scam.
Will moissanite pass a diamond tester?
Passing depends entirely on the tester device. Basic thermal diamond testers often read moissanite as real diamond. Moissanite carries heat in a way similar to real diamonds. You must use an electrical moissanite tester or a multi tester to get an accurate answer.
Is VVS moissanite real or fake?
VVS moissanite is real moissanite as long as it passes proper gemstone tests. VVS stands for a clarity level showing tiny hidden inclusions. This grade describes how clear the gem appears, not its authenticity. Always verify your gemstone using a certificate and a proper tester.
Can a jeweler tell it is moissanite?
Yes, jewelers can spot moissanite very quickly. A jeweler uses a multi tester to identify the gem within minutes. A close look through a jeweler loupe reveals double refraction lines inside the stone. Gemological labs can also confirm the stone with advanced light equipment.
Does real moissanite get cloudy?
Real moissanite does not turn cloudy on its own. A hazy appearance means body oil, soap, or lotion sits on top of the gemstone. Cleaning the stone with warm soap water and a soft brush removes that coating and brings back the shine.
