The Moissanite Guide
Moissanite is not a diamond substitute pretending to be something it isn't — it is its own gemstone, silicon carbide, first identified in a meteor crater in 1893 by Henri Moissan. Nearly all moissanite today is lab-created, and it has become the smartest entry point into fine jewelry.
What makes it remarkable
| Property | Moissanite | Diamond |
|---|---|---|
| Hardness (Mohs) | 9.25 — harder than any gem except diamond | 10 |
| Refractive index | 2.65–2.69 (higher than diamond) | 2.42 |
| Dispersion ("fire") | 0.104 — more than double diamond's | 0.044 |
| Toughness | Excellent — resists chipping | Excellent |
In plain terms: moissanite is slightly less hard than diamond but throws more rainbow fire. Some people love the extra spectacle; purists prefer diamond's whiter, more restrained sparkle. Neither is wrong.
Honest pros and cons
- Pro — price. Moissanite costs a small fraction of even a lab-grown diamond, making a confident carat size accessible on almost any budget.
- Pro — durability. At 9.25 on the Mohs scale it is entirely suited to daily wear, including engagement rings.
- Con — the "rainbow" effect. The doubled fire is visible, especially in larger stones and sunlight. See it in person or on video before deciding.
- Con — no grading ecosystem. Moissanite isn't graded by IGI or GIA the way diamonds are; quality depends on the maker's cut and material standards.
Caring for moissanite
Warm water, a drop of mild soap, and a soft brush restore its fire in minutes. It will not cloud or fade with time — the stone your grandchildren inherit will sparkle like the one you unboxed.
Who it's for
Choose moissanite if size and spectacle per dollar matter most, or as a first fine-jewelry purchase you can upgrade later. Choose a lab-grown diamond if you want a diamond, full stop. Our comparison guide goes deeper: lab-grown vs moissanite.
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