Moissanite vs. Diamond: How to Choose
The short version: Moissanite and diamond are different stones. Moissanite is lab-created silicon carbide, scores about 9.25 on the Mohs hardness scale, and shows more colorful fire than diamond, at a fraction of the price. Diamond is natural crystallized carbon and the hardest material at 10. Both are beautiful; the right choice depends on budget and priorities.
Moissanite has become a popular center stone, and it is easy to see why. To the casual eye it sparkles like a diamond and costs far less. But the two are genuinely different gemstones, and knowing how they compare helps you choose with confidence. Here is a clear, honest breakdown.
What is moissanite, exactly?
Moissanite is silicon carbide. Although it occurs in nature only in tiny, rare amounts, the moissanite sold in jewelry is lab-created. A natural diamond, by contrast, is crystallized carbon formed in the earth. They are chemically and optically distinct, which is why a trained jeweler can always tell them apart. Importantly, the Federal Trade Commission requires that moissanite be clearly disclosed as what it is, not represented as a diamond.
How do moissanite and diamond compare?
| Property | Moissanite | Natural diamond |
|---|---|---|
| What it is | Silicon carbide (lab-created) | Crystallized carbon (natural) |
| Hardness (Mohs) | About 9.25 | 10 (the hardest natural material) |
| Fire / sparkle | More dispersion (about 0.104), so more colorful flashes | Dispersion about 0.044; the classic white sparkle |
| Price | A fraction of a comparable diamond | Significantly higher |
| Telling them apart | Doubly refractive; needs a dedicated tester because it conducts heat like diamond | Singly refractive |
| Disclosure | Must be disclosed as moissanite, not a diamond (FTC) | Disclosed as natural diamond |
A note on testing
Because moissanite conducts heat much like diamond, a basic thermal "diamond tester" can mistakenly read moissanite as diamond. That is exactly why the FTC emphasizes disclosure, and why jewelers use a dedicated moissanite tester to be certain. It is also why buying from a reputable jeweler matters.
Which one is right for you?
There is no wrong answer; it is about what you value:
- Choose moissanite if you want maximum size and sparkle for the budget, with extra fire, and you are comfortable with a lab-created stone.
- Choose a natural diamond if you value its natural origin, its status as the hardest material, and its traditional, timeless white brilliance.
- Consider a lab-grown diamond if you want a real diamond's properties at a lower price than natural; it is chemically a diamond, unlike moissanite.
Moissanite is not a fake diamond; it is a beautiful gemstone in its own right. The best stone is simply the one that fits your priorities and your budget.
See them side by side
The easiest way to decide is to compare stones in person. Visit our bridal collection or let our sourcing team bring options to you, then book an appointment to view moissanite, lab-grown, and natural diamonds together under the same light.
Sources
- Federal Trade Commission, Jewelry Guides and "In the Loupe" guidance on gemstone disclosure. ftc.gov
- GIA (Gemological Institute of America), moissanite and diamond gemstone properties. gia.edu
Skibell Fine Jewelry is a family-owned jeweler in Dallas, Texas, offering bridal and engagement rings, custom design, estate and fine jewelry, appraisals, and repair, by appointment on Preston Road. More from the Skibell Fine Jewelry team.
