Moissanite is often presented as "the diamond alternative." That's an understatement: it's a gemstone in its own right, with its own qualities — some of which surpass those of diamond. Here's an honest comparison, criterion by criterion.
Brilliance: Advantage Moissanite
A gemstone's brilliance is measured by its refractive index and its fire (the dispersion of light into colored flashes).
- Moissanite: refractive index of 2.65 to 2.69, fire of 0.104
- Diamond: refractive index of 2.42, fire of 0.044
Moissanite therefore reflects more light than diamond and produces more than twice as many rainbow flashes. In daylight, a well-cut moissanite "flashes" spectacularly — that's how connoisseurs recognize it.
Hardness: Nearly Equal
On the Mohs scale (which ranges from 1 to 10):
- Diamond: 10 — the hardest natural material
- Moissanite: 9.25 — harder than sapphire (9), ruby (9), and emerald (7.5-8)
Practically speaking, moissanite resists everyday scratches and is perfectly suitable for everyday jewelry, including an engagement ring. We detail this point in our guide on moissanite durability and care.
Price: 10 to 15 Times Cheaper
For equivalent size and quality, moissanite costs approximately 90% less than a diamond. A one-carat diamond solitaire retails between €4,000 and €8,000, while its moissanite equivalent can be found for a few hundred euros. Why such a difference? We explain this in our article dedicated to moissanite pricing.
Ethics: A Lab-Grown Gemstone
Moissanite used in jewelry is created in a laboratory. No mining, no conflicts related to extraction, a much lower environmental footprint than mined diamonds. For a generation that values meaning as much as sparkle, this is a decisive argument.
Can they be distinguished with the naked eye?
For an untrained eye: no. Moissanite is even regularly mistaken for diamond by long-time wearers. An equipped gemologist will distinguish them (especially by moissanite's birefringence and more pronounced fire), but in everyday life, no one will tell the difference — except by its superior sparkle.
The Verdict
| Criterion | Moissanite | Diamond |
|---|---|---|
| Brilliance (refraction) | 2.65 – 2.69 | 2.42 |
| Fire (dispersion) | 0.104 | 0.044 |
| Hardness (Mohs) | 9.25 | 10 |
| Price (1 carat equiv.) | ≈ €100 – €500 | ≈ €4,000 – €8,000 |
| Origin | Laboratory, traceable | Mine (mostly) |
Diamond retains its status and symbolic value. But if you're looking for maximum sparkle, everyday durability, and a price that leaves room for the rest of your life, moissanite is a rational — and magnificent — choice.
Want to see the difference for yourself? Discover our moissanite rings, designed in Paris.