Moissanite vs Diamond: What's the Difference and How to Choose

What is moissanite

Moissanite is silicon carbide, first discovered in a meteorite and today almost always lab-grown for jewelry. It isn't a “fake diamond” but a gemstone in its own right: nearly as hard as diamond, with even more fire, at a small fraction of the price. That's made it a popular choice for engagement and everyday rings.

Moissanite vs diamond at a glance

	Moissanite	Diamond
Hardness (Mohs)	9.25 — second only to diamond, very durable for daily wear	10 — the hardest natural material
Brilliance / fire	Higher refractive index — stronger rainbow fire, flashier sparkle	More white sparkle, a subtler, restrained fire
Composition	Silicon carbide, almost always lab-grown	Pure carbon, natural or lab-grown
Price	Roughly one-tenth of a natural diamond of the same size, or less	Natural diamonds are expensive; lab-grown less so
Tell them apart	Nearly impossible to tell by eye	Same

Which should you choose

Budget-first and want maximum sparkle: choose moissanite — the savings on the same size buy a bigger stone or a better setting.
Care about the material literally being diamond but want to save: choose lab-grown diamond.
Prefer subtle white light: diamond or a restrained moissanite cut; love rainbow fire: moissanite.
Everyday wear: both are hard enough — wear either with confidence.

How to care for it

Treat it like any stone-set piece: warm water with a little mild dish soap, gently brush the back of the stone (where oils collect most) with a soft brush, rinse and pat dry to restore its clarity. Avoid knocks against hard objects and contact with chemicals; if the setting is silver, polish it as you would any silver piece.

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Does moissanite cloud or change color over time?

No. Moissanite is stable silicon carbide and won't cloud or fade from everyday wear. If it looks hazy, that's usually skincare and oils on the surface — a quick clean restores the clarity.

Will people know it's moissanite, not a diamond?

In everyday settings, almost never. The two are extremely hard to tell apart by eye — only specialized instruments can be sure. Moissanite throws slightly more rainbow fire, so if you prefer subtle white sparkle, choose a more restrained cut.

On a budget — moissanite or lab-grown diamond?

It depends on what you value. For maximum sparkle and the best value, choose moissanite; if you want the material to literally be diamond while saving money, choose lab-grown. Both cost far less than natural diamonds and both are plenty durable for daily wear.

Next: How to measure your ring size →