If you're shopping for a diamond alternative, chances are you've come across two options that keep coming up: moissanite and lab grown diamonds. Both look stunning, both are eco-conscious choices, and both cost a fraction of mined diamonds. But they're not the same stone — and knowing the difference can save you money and help you choose the right piece for you.
In this guide, we break down everything: what each stone is, how they compare in hardness, brilliance, and price, and which one is actually the better buy in 2026.
What Is Moissanite?
Moissanite is a lab-grown gemstone made of silicon carbide (SiC). It was first discovered in 1893 by Nobel Prize–winning chemist Henri Moissan inside a meteor crater in Arizona. Natural moissanite is incredibly rare — rarer than diamonds — so virtually all moissanite sold today is grown in labs using advanced thermal processes.
The result is a crystal with extraordinary optical properties. Moissanite has a higher refractive index than diamond (2.65–2.69 vs. 2.42), which means it scatters more light and produces more rainbow-colored fire. It's also one of the hardest materials on Earth, rating 9.25–9.5 on the Mohs scale — just below diamond.
Moissanite is the stone used in all Montier jewelry. Our pieces are set with D color VVS1 moissanite — the highest clarity and whitest color grade available — and mounted in real 14K gold over a solid 925 sterling silver base.
What Is a Lab Grown Diamond?
A lab grown diamond is a real diamond — chemically, physically, and optically identical to a mined diamond. It's grown in a laboratory using either High Pressure High Temperature (HPHT) or Chemical Vapor Deposition (CVD) processes that replicate the conditions deep underground where natural diamonds form.
Lab grown diamonds score 10 on the Mohs scale (the maximum), carry the same GIA grading system, and are graded on the same 4Cs: cut, color, clarity, and carat weight.
Moissanite vs Lab Grown Diamond: Side-by-Side Comparison
Hardness
Diamond: 10 (the hardest mineral known)
Moissanite: 9.25–9.5
Both are suitable for everyday wear, including engagement rings. You'd have to work hard to scratch either one. For practical purposes, the difference in hardness is irrelevant for most people.
Brilliance and Fire
Diamond: Refractive index 2.42 — produces brilliant white sparkle
Moissanite: Refractive index 2.65–2.69 — produces more rainbow fire (dispersion)
This is where personal taste comes in. Diamond lovers tend to prefer the crisp white brilliance of a diamond. Moissanite fans love the colorful, disco-ball effect. In direct sunlight, moissanite throws stunning flashes of color. Under softer lighting, it reads nearly identical to a diamond.
Appearance / Color
Modern moissanite — especially D color VVS1 — is completely colorless and virtually indistinguishable from a high-quality diamond to the naked eye. Earlier generations of moissanite had a slight yellow or green tint, but today's lab-grown stones have eliminated that entirely.
Price
This is where moissanite wins decisively.
- A 1-carat lab grown diamond: $1,000–$3,500 depending on cut and clarity
- A 1-carat moissanite: $150–$600
You can get a 2-carat moissanite tennis necklace for the price of a 0.3-carat lab diamond solitaire. The price gap is massive — and it means you can wear much more stone for the same budget.
Resale Value
Neither moissanite nor lab grown diamonds hold value well on the secondary market. Lab grown diamond prices have dropped over 70% in the past three years as production has scaled up. Moissanite has no resale market to speak of. In both cases, buy what you love to wear — not as an investment. If you want the full breakdown on jewelry as investment, read our moissanite investment guide.
Eco-Friendliness
Both are far more eco-friendly than mined diamonds. Lab grown diamonds require significant energy to produce (the HPHT or CVD process is energy-intensive). Moissanite uses slightly less energy per carat to produce. Neither involves mining, displacement of communities, or ecological destruction of riverbeds and open-pit mines.
Can a Jeweler Tell the Difference?
A trained gemologist with a thermal conductivity tester (the tool used to "test" diamonds) can sometimes get an inconclusive reading for moissanite — because moissanite conducts heat similarly to diamond. A more advanced electrical conductivity tester can distinguish them. But visually? Almost impossible without a loupe and extensive experience.
The bottom line: your friends, family, and colleagues will not know. Even jewelry-savvy people are frequently fooled.
Which Should You Buy?
Here's our honest take:
- Buy moissanite if you want maximum size and sparkle per dollar, you love colorful fire, or you want to stack multiple pieces without breaking the bank. Moissanite is also a great choice for fashion-forward jewelry, chains, bracelets, and everyday pieces.
- Buy a lab grown diamond if you specifically want a GIA-graded stone, you're buying for an engagement ring tradition, or the diamond's 10/10 hardness rating matters to you for a specific reason.
For most people buying chains, rings, earrings, or stacking pieces, moissanite is simply the smarter choice. You get more stone, more sparkle, and more jewelry for the same budget. That's why it's become the go-to stone for people who love fine jewelry without the markup.
How to Style Moissanite
Once you've made the switch to moissanite, the fun starts. You can layer and stack multiple pieces, build a full set from earrings to rings to chains, and create an iced-out look that rivals anything you'd see in a jeweler's showcase — at a fraction of the cost.
Final Verdict
Moissanite and lab grown diamonds are both excellent choices — and both are infinitely better than mined diamonds on price, ethics, and environmental impact. The real decision comes down to what you prioritize: if it's pure tradition and GIA certification, go lab grown diamond. If it's sparkle, size, and value, moissanite wins every time.
At Montier, we've built our entire line around the belief that you shouldn't have to choose between quality and affordability. Every piece features D color VVS1 moissanite in a real 14K gold over a solid 925 sterling silver base — the look and feel of fine jewelry, without the fine jewelry price tag.
Browse our full collection and find your next piece: Shop All Jewelry →