Moissanite vs Diamond: The Honest Breakdown

If you have spent any time shopping for fine jewelry, you have seen moissanite show up. Pages talk about "more brilliant than diamond" and "a fraction of the cost" and leave you wondering: is any of this real or is moissanite just a nice way to describe cubic zirconia?

Here is the honest answer with no marketing spin.

Moissanite is a real gemstone

Silicon carbide. Discovered in 1893 by a French chemist named Henri Moissan, in a meteor crater in Arizona. In its natural form, it is one of the rarest gems on earth, which is why every piece of moissanite jewelry you will ever see is lab-grown. Lab-grown does not mean artificial. It means the same chemical compound, grown under controlled conditions instead of taking millions of years underground.

Moissanite vs cubic zirconia vs diamond

This is where people get confused. These three are not the same.

• Cubic zirconia (CZ): Mohs hardness 8 to 8.5. Cloudy within a year. Not a "real" gemstone in any meaningful sense. Looks like glass eventually.
• Moissanite: Mohs hardness 9.25. Second hardest gem after diamond. Will not cloud, chip, or dull with normal wear. More brilliant than diamond by measurable optical standards.
• Diamond: Mohs hardness 10. Hardest natural substance. Less brilliance and less "fire" than moissanite but classic and culturally dominant.

The optical truth

Diamond has a refractive index of 2.42. Moissanite's is 2.65 to 2.69, which means moissanite bounces more light out of the stone. Diamond's dispersion (fire, the rainbow flashes) is 0.044. Moissanite's is 0.104, which is more than double. Under the same light, moissanite reads visibly more sparkly and more colorful.

Some people love that. Some people find diamond's whiter, more subdued brilliance classier. Both are valid preferences.

Can jewelers tell?

A diamond tester that only checks thermal conductivity will give a false positive for moissanite (both conduct heat similarly). To definitively distinguish, a jeweler needs a moissanite-specific tester or a trained eye under magnification, looking for the slight double refraction that moissanite shows and diamond does not.

In everyday life, no one can tell without a tester. You can wear moissanite to a wedding, a board meeting, a bar. It looks like fine jewelry because it is.

Why it costs less

Two reasons. First, the De Beers effect. Diamond supply has been artificially controlled for a century, which has kept prices high independent of actual rarity. Second, lab-grown production is genuinely more efficient than mining, and moissanite production is more efficient than lab-grown diamond production.

A 1-carat moissanite costs around $100 to $600 depending on cut and clarity. A comparable natural diamond costs $3,000 to $10,000+.

What "GRA-certified VVS1" means

GRA is the Gem Research Association, the primary independent grading body for moissanite. VVS1 stands for "very very slightly included, grade 1," which is the highest clarity tier commonly available. It means inclusions (internal imperfections) are practically invisible even under 10x magnification. Every Arvea stone is GRA-certified VVS1 colorless (D-F equivalent, the top of the color scale).

The ethics angle

Every lab-grown stone, by definition, is conflict-free, environmentally lighter, and not the product of labor practices that have historically plagued the diamond trade. This matters to some people and not to others. We bring it up because it is factually true, not as a guilt trip.

The short version

Moissanite is a real gemstone. It is harder than almost anything you own, more brilliant than diamond by objective optics, lab-grown, and dramatically cheaper. The only time it matters that it is not a diamond is the moment someone pulls out a specialized tester, which is not a moment that happens in real life.

Arvea uses 1-carat GRA-certified VVS1 moissanite in every zodiac pendant, set in 18k gold vermeil. Shop the collection.