Moissanite FAQ
Everything You Need to Know

Moissanite is a lab-grown gemstone made of silicon carbide (SiC). It was originally discovered in a meteor crater in 1893 by Nobel Prize-winning chemist Henri Moissan — hence the name. Natural moissanite is extraordinarily rare; virtually all moissanite on the market today is grown in controlled laboratory conditions, making it conflict-free and environmentally responsible.

Yes. Moissanite is a real, naturally-occurring gemstone — silicon carbide (SiC) — first found in 1893. The moissanite in jewelry is lab-created, but that does not make it fake. Lab-created gems have identical chemical and physical properties to their natural counterparts. Moissanite is not an imitation; it is its own distinct gemstone with a higher refractive index than diamond.

Moissanite was discovered in 1893 by Henri Moissan, a French chemist who later won the Nobel Prize in Chemistry. He found the mineral silicon carbide in a meteorite crater in Canyon Diablo, Arizona. He initially mistook the crystals for diamonds but later identified them as a new mineral. The gem was named moissanite in his honor.

Modern moissanite is grown in a laboratory using thermal growth processes that replicate extreme heat and pressure. Silicon and carbon are combined under carefully controlled conditions to grow silicon carbide crystals over several months. These are then cut and faceted just like diamonds. The process produces gemstones with consistent quality, color, and clarity — and without the environmental impact of mining.

Moissanite is classified as a semi-precious to precious gemstone by most gemologists. With a Mohs hardness of 9.25 — second only to diamond — and a refractive index higher than diamond (2.65 vs 2.42), it is durable enough and optically brilliant enough for daily fine jewelry wear. Many jewelers and buyers now treat it as a premium gemstone in its own right, not merely a diamond alternative.

No. Moissanite is not a diamond. Diamond is carbon; moissanite is silicon carbide. They are chemically and structurally different minerals. Moissanite is sold as its own gemstone, not as a diamond substitute or imitation. It has its own beauty — a higher refractive index (more brilliance) and a distinctive fire that many people prefer over diamond.

Experienced jewelers can distinguish moissanite from diamond using a standard diamond tester — moissanite conducts heat differently and reads differently on most thermal testers. Visually, moissanite shows more "rainbow fire" (double refraction) that a trained eye can spot in certain lighting. To most casual observers and in typical room lighting, moissanite is indistinguishable from diamond.

Moissanite has a higher refractive index (2.65 vs 2.42), meaning more brilliance. Both are nearly as hard — moissanite 9.25, diamond 10 on the Mohs scale. Moissanite costs 80–90% less than natural diamond. The key visual difference is that moissanite shows more colorful fire (dispersion 0.104 vs diamond's 0.044). For a full breakdown see our moissanite vs diamond guide.

Lab-grown diamonds are chemically identical to mined diamonds; moissanite is a different gemstone. Lab diamonds score 10 on Mohs vs moissanite's 9.25. Lab diamonds cost 50–70% less than mined diamonds, but still significantly more than moissanite. If you want maximum brilliance per dollar, moissanite wins. If you want exact diamond properties, lab diamond is the answer. See our full moissanite vs lab diamond vs CZ comparison.

Moissanite and CZ are both often described as diamond alternatives, but they are very different. CZ scores 8–8.5 on the Mohs scale and scratches, clouds, and loses brilliance over time. Moissanite scores 9.25 and is built for a lifetime of daily wear. Moissanite costs more than CZ but dramatically outperforms it in longevity and optical quality. CZ is fine for fashion jewelry; moissanite is fine for engagement rings.

No. Moissanite does not cloud, dull, or change color over time — unlike cubic zirconia, which is notorious for clouding. The silicon carbide structure of moissanite is chemically stable and will not degrade. Surface buildup from lotion, soap, and oils can make any gemstone look dull, but a simple cleaning restores moissanite to its original brilliance. Many owners wear the same stone for decades with no degradation.

Moissanite can only be scratched by materials harder than it — in everyday life, essentially only diamond. At 9.25 on the Mohs scale, moissanite is harder than sapphire (9), topaz (8), and quartz (7). The only risk of physical damage is chipping from a sharp, direct impact at exactly the right angle — the same risk applies to any gemstone, including diamond.

Clean moissanite with warm water, mild dish soap, and a soft toothbrush. Scrub gently around the setting, rinse thoroughly, and pat dry with a lint-free cloth. Ultrasonic cleaners are safe for moissanite stones — check your metal setting before using one. Avoid harsh chemicals like bleach or chlorine, which can damage metal settings. Monthly cleaning keeps moissanite at its most brilliant.

Yes. At 9.25 on the Mohs scale, moissanite is extremely durable for daily wear. Most jewelers consider anything above 7.5 suitable for daily use; moissanite exceeds that significantly. You can wear it while washing hands, cooking, and exercising without concern for normal scratching. Remove it before activities that involve sharp impacts or prolonged exposure to harsh chemicals.

No. Moissanite looks like a high-quality, exceptionally brilliant gemstone — because that's exactly what it is. It is, however, noticeably different from diamond in certain lighting: moissanite produces more colorful "rainbow" sparkle (higher dispersion). Whether that looks more beautiful or slightly different is personal preference. In photos, on the finger, and in typical room lighting, moissanite is consistently described as stunning.

Yes — moissanite offers more optical brilliance than diamond at 10–20% of the cost. It is durable enough for a lifetime of daily wear. The only meaningful trade-offs: it's not a diamond (so it won't hold resale value like a mined diamond), and it shows slightly different fire that experts can identify. If you want maximum visual impact per dollar on fine jewelry, moissanite is one of the best buys available. Read more in our moissanite engagement ring guide.

Round brilliant is universally the best cut for maximizing moissanite's fire and brilliance. Round moissanite captures and returns the most light, creating the highest sparkle. For a distinctive look, oval moissanite is the next-best performer and appears larger face-up. Cushion and radiant cuts are also excellent. Avoid very deep cuts that trap light inside the stone.

A 6.5mm round moissanite is equivalent to a 1-carat diamond in face-up diameter — the size you actually see on the finger. Because moissanite is slightly less dense than diamond, a 1-carat moissanite by weight measures slightly larger than a 1-carat diamond. When shopping for moissanite, use millimeter dimensions rather than carat weight for accurate size comparison.

Sterling silver is an excellent, affordable choice for moissanite jewelry — especially for earrings, pendants, and fashion rings. Its bright white tone complements moissanite's brilliance beautifully. The trade-off: silver tarnishes over time and requires periodic polishing. For engagement rings worn every day, many buyers prefer rhodium-plated silver or gold for longer-lasting durability. Check out our moissanite rings collection for options.

There are excellent moissanite rings available under $100 that offer real fine jewelry quality. The sweet spot for value is in the $55–$85 range — solitaire or halo settings in sterling silver with round brilliant moissanite. See our full breakdown in the best moissanite rings under $100 guide, including specific picks with prices.

WELCOME10 is Yimola21's welcome discount — 10% off your first order. Subscribe to the Yimola email list at the bottom of this page and the code will be sent to your inbox immediately. It applies to your first purchase at yimola21.com.

Yimola21 delivers in 5–10 business days to most US addresses. Orders are processed within 1–2 business days, after which you'll receive a tracking number by email. For time-sensitive gifting, order at least 10 business days in advance to allow for any delays. See our gift guide for occasion-based shopping timelines.

Yimola21 accepts returns and exchanges on unworn items within 30 days of delivery. Items must be in original condition with packaging. To start a return, contact the store directly through yimola21.com. Custom or personalized pieces are typically non-returnable — check the product listing for details.

Yimola21 stands behind the quality of its pieces. If you receive a defective item or experience a manufacturing issue, contact the store directly through yimola21.com for resolution. The moissanite gemstones themselves are durable by nature and should not degrade, cloud, or discolor under normal wear conditions.