Real moissanite throws strong rainbow flashes in sunlight, and shows slight double refraction at the facet edges under a 10x loupe. Also, it passes a combined diamond plus moissanite tester and comes with a clear certificate from a known lab or brand.
If the stone looks flat and glassy, fog lingers on the surface, the listing hides millimeter sizes or return terms, and the price is suspiciously low, walk away as that is definitely not real Moissanite.

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Why Fake Moissanite Keep Showing Up?
Moissanite gives a big sparkle and toughness at a fair price, so demand is high. That attracts sellers who swap in cubic zirconia, glass, or low-grade quartz and market it as moissanite, especially on watch bezels where stones are small and numerous. The fix is simple, test the stones and check the paperwork before you pay.
What a Real Stone Looks and Behaves Like

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Fire and brilliance: Moissanite has intense rainbow fire under direct light.
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Double refraction: Viewed at an angle with a loupe, some facet edges look doubled.
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Hardness: 9.25 on the Mohs scale, so it resists scratches far better than CZ, glass, or quartz.
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Cut quality: Crisp, even facets with clean meet points.
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Weight cues: Moissanite is lighter than CZ at the same size, though this is hard to judge on a finished watch.
Quick Guide You Can Use While Shopping Moissanite

Old thermal diamond testers fail and often call moissanite a diamond because both move heat away quickly. A combined tester that also checks electrical conductivity separates them correctly. If a seller refuses a tested result, that is a red flag by itself.

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How to Check at Home Without Tools?

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Sunlight spin: Rotate the watch slowly. You should see lively rainbows, not gray flickers.
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Photo zoom: Take a sharp phone photo in bright light, then zoom in. Look for crisp facet lines, not orange peel texture.
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Paper printout: If the listing claims specific millimeter sizes, measure a few stones on macro photos. Fakes often skip mm data or mix sizes within the same bezel.
Which Tools Can Justify That the Moissanite is Real or Fake?
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10x loupe: Learn to spot doubled facet edges and clean meet points.
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Combined tester: Heat plus electrical testing gives a clear read on moissanite vs diamond vs CZ.
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UV lamp: Some moissanite shows mild fluorescence. CZ responses vary, so use this only with other signs.
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Microscope at a jeweler: A quick bench look often settles it in minutes.
Common Myths, Corrected
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“It feels heavy, so it is real.” CZ is heavier than moissanite, so weight is not proof.
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“A diamond tester said diamond, so it is diamond.” Thermal testers often misread moissanite. Use a combined tester.
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“Rainbow fire means CZ.” Moissanite shows stronger, cleaner rainbow fire than CZ when cut well.
Buyer’s Safety Checklist: Follow These 6 Steps Before Buying Moissanite

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Ask for a certificate and a real return policy.
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Test stones with a combined diamond plus moissanite tester, or have a local jeweler do it while you wait.
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Check sparkle in sunlight, then verify facet edges with a loupe.
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Read the specs for exact millimeter sizes and the number of stones.
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Compare pricing across two or three reputable stores to see the fair range.
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Keep all documentation and unboxing photos in case you need to return.

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What to Do If You Already Bought Moissanite and Have Doubts?
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Do a same day check: Sunlight fire, loupe edges, combined tester if you can.
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Contact the seller: Ask for the certificate and the exact stone specs they used.
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Get a bench opinion: A local jeweler can usually tell quickly.
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Use the return window: Do not wait. Return clean and complete if results do not line up.
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Report the listing: If it was a marketplace, file a claim with your test results and the jeweler’s note.
Why Do Reputable Sellers Matter While Buying Moissanite?
Trusted makers publish stone sizes in millimeters, disclose grade, and back the watch with a certificate and a fair warranty.
Stores like Glazed Diamonds list the info you need up front and ship pieces that survive close inspection. That saves you time, avoids returns, and gives you the sparkle you expected.
Final Words
If you want a safe place to start, browse moissanite watches from trusted stores like Glazed Diamonds that state exact millimeters and offer a proper certificate. That way the piece you wear next month looks like the one you saw today.