Moissanite
Moissanite vs. Lab-Grown Diamond: Which Should You Choose?
Emma Carter · June 10, 2026 · 2 min read
If you're shopping for a diamond alternative, two names come up again and again: moissanite and lab-grown diamonds. Both are stunning, ethical, and far more affordable than a mined diamond, but they're different stones. Here's how to choose.
First, a quick word on mined diamonds
Mined diamonds form over billions of years under heat and pressure deep in the earth, then are extracted, sorted, cut, and polished. That long, complex supply chain is a big reason they're so expensive. Both options below give you diamond-like beauty without that price tag.
What is moissanite?
Moissanite is a lab-created gemstone made of silicon carbide. It's beautiful, exceptionally sparkly, hard (9.25 on the Mohs scale), easy to maintain, and budget-friendly. Its refractive index (2.65 to 2.69) is higher than a diamond's, so it shows more colorful fire.
What is a lab-grown diamond?
A lab-grown diamond is a real diamond, chemically and optically identical to a mined one, just created in a lab instead of the earth. It scores a 10 on the Mohs scale and has a diamond's classic white brilliance (refractive index 2.42). Because it isn't mined, it costs significantly less than a natural diamond.
Moissanite vs. lab-grown diamond at a glance
| Feature | Moissanite | Lab-Grown Diamond |
|---|---|---|
| Material | Silicon carbide | Real diamond (carbon) |
| Hardness (Mohs) | 9.25 | 10 |
| Refractive index | 2.65 to 2.69 | 2.42 |
| Sparkle | More colorful fire | Classic white brilliance |
| Is it a real diamond? | No, a distinct gemstone | Yes |
| Relative price | Most affordable | More than moissanite, less than mined |
| Ethics | Lab-created, conflict-free | Lab-created, conflict-free |
Sparkle
Moissanite shows more fire and rainbow flashes, while a lab-grown diamond has the whiter, more classic diamond sparkle. Taste decides.
Hardness
Lab-grown diamond is a perfect 10 and moissanite is 9.25. Both are excellent for everyday wear.
Price
Moissanite is the most affordable. Lab-grown diamonds cost more than moissanite but far less than mined diamonds, often 40 to 70% less. Your budget and priorities decide.
Is it a "real diamond"?
A lab-grown diamond is a real diamond. Moissanite is a real gemstone, but a distinct one, not a diamond. Reputable sellers are always clear about which is which.
Ethics
Both are lab-created and conflict-free, with a smaller footprint than mining.
Which should you choose?
- Want a true diamond at a lower price, with classic white brilliance? Lab-grown diamond.
- Want maximum sparkle and the best value, or the biggest look for your budget? Moissanite.
For more, see Natural Diamond vs. Moissanite and our Ultimate Guide to Moissanite.
The bottom line
You can't go wrong, both are beautiful, ethical, and affordable. If you'd like help choosing for your specific ring, get a quote and we'll walk you through it.
Frequently asked questions
- Is moissanite or lab-grown diamond more expensive?
- Moissanite is generally the more affordable of the two. Lab-grown diamonds cost more than moissanite but far less than mined diamonds.
- Can you tell moissanite and lab-grown diamond apart?
- Up close, moissanite shows more rainbow fire while a lab-grown diamond looks whiter. A jeweler's tester can distinguish them, but to most eyes both are gorgeous.
- Which is more durable?
- Lab-grown diamond is hardest at 10 on the Mohs scale, and moissanite is close behind at 9.25. Both stand up well to daily wear.
- Which is more ethical?
- Both are lab-created and conflict-free. If avoiding mining is your priority, either is a great choice.
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