"Moissanite or diamond?" is the question every modern jewellery shopper eventually asks. Here's the honest, head-to-head answer — covering sparkle, durability, price, and ethics — so you can choose what's actually right for you.
What is moissanite?
Moissanite is a lab-created gemstone made of silicon carbide. It was first discovered in 1893 by the Nobel Prize-winning French chemist Henri Moissan, in rock from a meteorite crater — he initially thought he'd found diamonds. Because natural moissanite is incredibly rare, today's moissanite is grown in a lab, which makes it ethical, consistent, and beautifully affordable.
Sparkle & fire: where moissanite wins
Moissanite doesn't just match a diamond's sparkle — it out-fires it. Its refractive index is 2.65 versus a diamond's 2.42, and its dispersion (the "fire" that splits light into rainbow flashes) is 0.104 versus a diamond's 0.044. That's roughly 2.4 times the fire.
The result is a livelier, more colourful flash — the kind of sparkle that catches the eye across a room. For a generation that wants their jewellery to actually glow, that's a feature, not a flaw.
Durability for everyday wear
Moissanite scores 9.25 on the Mohs hardness scale. Diamond is the only gemstone harder, at 10 — moissanite beats sapphire, ruby, and every other stone. It has no cleavage plane, doesn't chip easily, and won't cloud or scratch with daily wear. In other words: it's built for the ring you never take off.
Price: the headline difference
This is where it gets fun. Moissanite costs a small fraction of a diamond of the same size — often 90% less per carat. That means more sparkle, more size, and more pieces for the same budget. It's the whole reason affordable luxury exists.
Ethics & sustainability
Because it's lab-created, moissanite is conflict-free and mining-free by definition. No murky supply chains, no environmental damage from extraction. For conscious shoppers, it's an easy yes.
Can anyone tell the difference?
To the naked eye, moissanite and diamond look strikingly similar. The main visible difference is moissanite's extra fire — which most people read as simply "stunning." Under a jeweller's loupe, moissanite shows double refraction, but that's invisible in everyday life.
Moissanite vs lab-grown diamond
A quick clarification: moissanite is its own gemstone, not a lab-grown diamond. A lab-grown diamond is still a diamond (pure carbon); moissanite is silicon carbide — a different, more fiery, more affordable gem in its own right. At Auralie, we celebrate moissanite (and brilliant cubic zirconia) for exactly what they are.
So which should you choose?
If you want maximum sparkle, everyday durability, ethical sourcing, and a price that lets you build a whole jewellery wardrobe — moissanite is the smart, modern choice. Learn more about moissanite, or go straight to the good part:
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FAQ
Is moissanite as good as a diamond?
For everyday jewellery, arguably better: more fire, excellent durability, ethical sourcing, and a fraction of the price. A diamond is harder (Mohs 10 vs 9.25) and holds more resale value, but for sparkle-per-pound, moissanite wins comfortably.
Does moissanite get cloudy?
No. Moissanite doesn't cloud, fog, or lose its sparkle over time. A quick clean in warm soapy water restores its brilliance instantly.
Is moissanite a real gemstone?
Yes. It's a real mineral (silicon carbide) that occurs naturally but is extremely rare, so jewellery-grade moissanite is lab-created.
Will people know my moissanite isn't a diamond?
Not from looking. The stones are near-identical to the naked eye; moissanite's extra fire reads as beautiful rather than obviously different.
