Moissanite vs Diamond: What's the difference?
What Is Moissanite?
Moissanite is a lab-grown gemstone made of silicon carbide. First discovered in 1893 in a meteor crater by French chemist Henri Moissan, it’s now recognized for its brilliance, durability, and ethical sourcing. A cost-effective alternative to diamonds, moissanite has become a favorite for engagement rings and fine jewelry.
Moissanite vs Diamond
A diamond’s unique sparkle comes from light reflection, refraction, and scintillation. Moissanite shares these traits but has over twice the fire—brighter rainbow flashes—than diamonds, especially in larger sizes. This vivid, disco‑ball‑like effect is the easiest way to tell them apart.
For a professional check, a gemologist can use a loupe to spot facet doubling, which confirms whether a stone is moissanite or diamond.
Is a Moissanite a Diamond?
No. Moissanite is not a diamond. Lab-grown moissanite looks similar to diamond but differs in composition: diamond is carbon, while moissanite is silicon carbide.
Moissanite has a higher refractive index and stronger rainbow ‘fire’ than diamond. Diamond is harder, with a Mohs hardness of 10 versus 9.25 for moissanite.
Though both have dispersion, scintillation, and good thermal conductivity, they are fundamentally different gemstones.
How to Tell a Moissanite From a Diamond
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Moissanite vs. Diamond FAQ
Is moissanite a real gemstone?
Yes! Moissanite is a genuine lab-created gemstone made from silicon carbide. It’s not a fake or imitation of any other gem—it's valued for its own beauty and brilliance.
Does moissanite sparkle more than a diamond?
Yes. Moissanite has a higher refractive index than diamond, meaning it reflects more light and produces more fire (colorful flashes).
Will moissanite lose its sparkle over time?
No. Unlike cubic zirconia, moissanite maintains its fire and clarity forever.
How does moissanite differ from a diamond?
While both are brilliant and durable, moissanite has more fire (rainbow sparkle), a slightly different color tone in large sizes, and is much more affordable and eco-friendly.