Is moissanite a real diamond? What sets a natural diamond apart

A ring that sparkles hard and costs far less can look like a lucky find. Is moissanite a real diamond? Here is what it is, and how to tell the two apart.

Is moissanite a real diamond, or a fake one?

Moissanite is not a real diamond. A diamond is carbon crystallised deep in the earth, while moissanite is silicon carbide, a different material with its own hardness, its own way of handling light and its own weight.^[1] Calling it a fake is not quite fair either: it is a genuine gem material, simply not a diamond.

Moissanite was first identified by the French chemist Henri Moissan in fragments of a meteorite, and natural moissanite is too rare and tiny for jewellery.^[1] The stones in rings and earrings are grown in a laboratory, developed as a diamond look-alike in the 1990s.^[1] A natural diamond, by contrast, formed in the earth between one and 3.5 billion years ago.^[4]

The trouble starts when the two words get blurred. Phrases such as "moissanite diamond" or "diamond alternative" can make it sound like a type of diamond. Under a terminology standard notified by the Bureau of Indian Standards, IS 19469:2025, the word "diamond" on its own refers only to a natural diamond, and anything else must be named for what it is.^[2] US trade rules take the same line and treat it as deceptive to call a stone that is not a natural diamond simply a "diamond".^[3]

So the honest name is the plain one: moissanite. If a label, bill or certificate says "diamond" with no other word, it should be a natural diamond. Every diamond QWEEN sells is natural, so "diamond" on a QWEEN invoice means exactly that.

Moissanite vs diamond: how do they compare?

Moissanite and natural diamond differ in what they are made of, how hard they are, how they handle light and how they test.

The Mohs scale ranks minerals by how well they resist scratching, and diamond sits at 10, the very top.^[5] Moissanite at 9.25 is still harder than every other popular gem, so it wears well in a daily ring.^[1]

The refractive index measures how much a stone bends light. Moissanite bends it more than diamond does and also splits each ray in two, which is called double refraction.^[1] That one physical fact explains most of the visible differences.

Does moissanite look like a diamond?

Moissanite looks like a diamond from across a room, and up close it often looks different. Its stronger light-bending gives it bold flashes of rainbow colour, known as fire, especially under spotlights or sunlight.^[1] Some people love that effect; others find it too colourful next to the crisper white sparkle of a diamond.

The giveaway for a trained eye is the doubling. Because moissanite splits light in two, the back facet edges can look doubled or slightly blurred when you look through the top of the stone at an angle with a loupe.^[1] A diamond shows single, sharp edges.

A common case: two rings of the same size sit on a tray. In shop lighting both glitter. Tilt them slowly by a window, and the moissanite throws more rainbow while the diamond shows more bright white light and contrast. In QWEEN stores, pieces sit on open display, so you can pick up a natural diamond ring and study its sparkle yourself.

Can you tell moissanite from a diamond?

You can tell moissanite from a diamond with the right tools, but a simple tester is not one of them. Moissanite carries heat in a way similar to diamond, so a basic thermal "pen" tester can read it as a diamond.^[1] A beep on that kind of tester tells you the stone is either diamond or moissanite, nothing more. QWEEN stores have a DiamondIQ Meter™ for checking diamonds, and QWEEN backs every diamond with a lab certificate rather than a beep.

Telling a natural diamond from a lab-grown one is a separate and harder question, and it needs a gem lab's equipment.^[4] That is one more reason a certificate matters more than any quick test.

Is moissanite the same as a lab-grown diamond?

Moissanite is not the same as a lab-grown diamond. A diamond made in a laboratory is still carbon with the same crystal structure as a natural one. Moissanite is silicon carbide; it is not a diamond of any kind.^[1]

So there are really three different stones in this conversation: a natural diamond, a lab-grown diamond and moissanite. Under Indian standards a lab-grown diamond must be labelled "laboratory-grown" in full, and moissanite should be named as moissanite.^[2] The guide to natural and lab-grown diamonds covers how the first two differ in worth. QWEEN sells only the first of the three.

Is moissanite worth it, and does it hold its value?

Moissanite is worth it if you want a hard, bright, lab-made stone for its look and you are clear that you are not buying a diamond. At 9.25 on the Mohs scale it resists scratches well; like any stone, it dulls when lotion and dust build up, and a gentle clean brings the sparkle back.^[1]

Value is where the choice really sits. Because moissanite can be made to order, its price reflects a lab material, so ask any seller whether they will buy the piece back and on what terms. A natural diamond is a finite stone with a documented origin, and that is what many families keep and pass on.

Love the look you choose, and know exactly what it is.

How does QWEEN make sure your diamond is not moissanite?

QWEEN sets only natural diamonds and gemstones, and sells neither moissanite nor lab-grown diamonds. Moissanite is a hard, bright gem that wears well. Every stone QWEEN calls a diamond is a natural diamond, and QWEEN documents where each one comes from.

Every QWEEN diamond is certified by IGI, and QWEEN's signature solitaires come with a GIA grading report, so the paper names the stone. QWEEN sources its diamonds through one supply-chain partner, Rosy Blue, and traces each from rough stone to finished piece under Mine to Marvel™. QWEEN's sourcing follows the Kimberley Process. In QWEEN stores, you can walk in without an appointment and check a stone on the DiamondIQ Meter™. You can also look at QWEEN of Hearts™ round brilliants through the QWEEN of Hearts Viewer™; QWEEN says they are cut to a Hearts & Arrows standard.

To see it for yourself, hold a QWEEN diamond with its certificate in store, or book a QWEEN video consult to see a stone and its certificate on camera. You can also read how QWEEN certifies every stone on the certified jewellery page and the terms on lifetime exchange and buyback.

Seeing natural diamonds in the metal

QWEEN's diamond pieces below are set with certified natural diamonds, so you can see the crisp sparkle described above on a ring, two pairs of studs and a pendant.

18K · Snowfall White

Graceful Twist Solitaire Ring

View piece

18K · Desert Noon

No Holdbacks Solitaire Studs

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18K · Snowfall White

Guard Your Spark Studs

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18K · Rose Bloom

Starry Skies Pendant

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Frequently asked questions

References

1. GIA, Gems & Gemology, Synthetic moissanite: a new diamond substitute (1997) — on moissanite's composition, hardness, refraction, density and how it tests
2. Indian Jeweller, BIS notifies new diamond terminology standard (IS 19469:2025) — on "diamond" alone meaning natural and the "laboratory-grown" label
3. US FTC, 16 CFR 23.12, Definition and misuse of the word "diamond" — on qualifying any stone that is not a natural diamond
4. GIA, The difference between natural and laboratory-grown diamonds — on natural diamond age and lab identification
5. GIA 4Cs, The Mohs scale — on diamond at 10 on the Mohs scale