Moissanite vs. Lab-Grown Diamond: Which Is the Better Choice in 2027?

August 27, 2026

The lab-grown diamond market has exploded over the past five years. Prices have dropped dramatically — a 1-carat lab-grown diamond that cost $3,000 in 2020 can now be found for under $500 in 2027. This price collapse has changed the competitive landscape for moissanite, and it's prompted a question that many buyers are now asking: in 2027, is moissanite still the better choice, or has the lab-grown diamond price drop made diamonds the obvious answer?

This guide gives you the honest, data-driven answer. We compare moissanite and lab-grown diamonds across every dimension that matters to a buyer — brilliance, hardness, price, certification, resale value, and long-term value. We'll tell you when moissanite is the better choice and when a lab-grown diamond might be worth considering.

What Is a Lab-Grown Diamond?

A lab-grown diamond is a genuine diamond — chemically, physically, and optically identical to a mined diamond — created in a laboratory rather than extracted from the earth. Lab-grown diamonds are produced using two methods: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD). Both methods produce genuine diamond crystal (carbon) with the same properties as mined diamond.

Lab-grown diamonds are graded by the same laboratories (GIA, IGI) using the same 4Cs system as mined diamonds. They are not simulants — they are real diamonds. The only difference is their origin.

What Is Moissanite?

Moissanite is silicon carbide (SiC) — a naturally occurring mineral first discovered in a meteorite crater in 1893 by Nobel Prize-winning chemist Henri Moissan. All moissanite sold in jewelry today is lab-created, produced through a controlled crystal growth process that creates stones of exceptional quality and consistency.

Moissanite is not a diamond simulant in the traditional sense — it is a distinct gemstone with its own unique properties, some of which exceed diamond's. It is graded by the GRA (Gemological Research Association) using a system similar to the diamond 4Cs.

Brilliance: Moissanite Wins

Brilliance is determined by a stone's refractive index — how much it bends light as it passes through the stone. A higher refractive index means more light bending, which means more brilliance and fire.

Moissanite refractive index: 2.65–2.69
Diamond refractive index: 2.42

Moissanite has a significantly higher refractive index than diamond. This means moissanite produces more brilliance (white light return) and more fire (colored light dispersion) than diamond of the same size and cut quality. In direct comparison, a moissanite stone will typically appear more brilliant than a diamond — particularly in low-light conditions.

This is not a matter of opinion — it's physics. Moissanite's higher refractive index produces objectively more light performance than diamond. Whether you prefer moissanite's higher fire or diamond's slightly more subdued brilliance is a matter of personal taste, but the optical performance data is clear: moissanite wins on brilliance.

Hardness: Diamond Wins (Barely)

Hardness is measured on the Mohs scale, which rates a mineral's resistance to scratching from 1 (softest) to 10 (hardest).

Diamond Mohs hardness: 10 (the hardest natural material)
Moissanite Mohs hardness: 9.25

Diamond is harder than moissanite — but the practical difference in daily wear is negligible. A Mohs hardness of 9.25 means that moissanite can only be scratched by diamond or by materials harder than 9.25 on the Mohs scale. In daily wear, moissanite will not scratch from contact with any material you're likely to encounter — keys, countertops, other jewelry, or any surface in a normal environment.

For practical purposes, both moissanite and lab-grown diamond are appropriate for lifetime daily wear. The hardness difference is real but not meaningful in real-world conditions.

Price: Moissanite Wins — But the Gap Has Narrowed

The lab-grown diamond price collapse of 2022–2026 has significantly narrowed the price gap between moissanite and lab-grown diamonds. In 2020, a 1-carat lab-grown diamond cost 5–10x more than a comparable moissanite. In 2027, the gap is much smaller — but moissanite is still significantly less expensive.

A 1-carat DEW DEF VVS1 GRA-certified moissanite in a 14K gold solitaire setting: approximately $400–$800 depending on the setting.
A 1-carat D VS1 IGI-certified lab-grown diamond in a comparable 14K gold solitaire setting: approximately $800–1,500 depending on the seller.

Moissanite is still meaningfully less expensive than a comparable lab-grown diamond — and significantly less expensive than a mined diamond of the same specifications. For buyers who want the maximum stone size and quality for their budget, moissanite remains the better value.

Price Stability: Moissanite Wins

One of the most significant developments in the lab-grown diamond market over the past five years has been the dramatic and ongoing price collapse. Lab-grown diamond prices have fallen 80–90% since 2020, and the decline shows no signs of stopping. As production technology improves and manufacturing capacity expands, lab-grown diamond prices are expected to continue falling.

This price collapse has significant implications for buyers who are considering a lab-grown diamond as a "value" purchase. A lab-grown diamond purchased today for $1,000 may be worth $200–$300 in five years as prices continue to fall. The resale value of lab-grown diamonds is already near zero — and it's likely to remain there.

Moissanite prices have been stable for years. The stone's value proposition is not based on scarcity or market dynamics — it's based on its intrinsic quality. A moissanite ring purchased today will be worth approximately the same in five years as it is today.

Resale Value: Neither Wins (But Moissanite Is More Honest)

Neither moissanite nor lab-grown diamonds have meaningful resale value. Lab-grown diamond prices have collapsed so dramatically that the resale market is essentially non-existent. Moissanite has never had a significant resale market.

The difference is in the honesty of the value proposition. Moissanite has always been sold as a beautiful, durable stone at a compelling price — not as an investment. Lab-grown diamonds were initially marketed with the implication that they would hold value like mined diamonds. That implication has proven false, and buyers who purchased lab-grown diamonds expecting value retention have been disappointed.

For a complete analysis of moissanite's value proposition, see: Does Moissanite Have Resale Value? An Honest Answer.

Certification: Both Have Good Options

Lab-grown diamonds are certified by GIA (Gemological Institute of America) and IGI (International Gemological Institute) — the same laboratories that certify mined diamonds. GIA and IGI are well-established, widely recognized certification bodies.

Moissanite is certified by the GRA (Gemological Research Association) — the industry standard for moissanite certification. GRA certificates document the stone's color grade, clarity grade, cut grade, and carat weight, and the certificate number is verifiable online.

Both certification systems are credible and provide meaningful quality documentation. Neither has a significant advantage over the other from a buyer's perspective.

Ethical Sourcing: Both Win Over Mined Diamonds

Both moissanite and lab-grown diamonds are lab-created, which means neither involves mining. Both avoid the environmental destruction, human rights concerns, and conflict sourcing issues associated with mined diamonds. From an ethical sourcing perspective, both are excellent choices compared to mined diamonds.

For a complete guide to the ethical case for lab-created stones, see: The Ethical Case for Moissanite: Why Lab-Created Beats Mined Every Time.

The Verdict: Which Should You Choose in 2027?

Choose moissanite if: You want maximum brilliance and fire, the best value for your budget, price stability, and a lifetime warranty. Moissanite wins on optical performance, value, and long-term price stability.

Consider a lab-grown diamond if: You specifically want a stone that is chemically identical to diamond, you prefer diamond's slightly more subdued brilliance over moissanite's higher fire, or you want GIA/IGI certification specifically. Be aware of the ongoing price collapse and the near-zero resale value.

The honest bottom line: In 2027, moissanite remains the better choice for most buyers. It's more brilliant, more affordable, more price-stable, and backed by a lifetime warranty that lab-grown diamond sellers typically don't offer. The lab-grown diamond price collapse has made diamonds more accessible — but it has also made them a less compelling value proposition, not a more compelling one.

Explore our DEF VVS1 moissanite collection — every stone GRA-certified and backed by our Lifetime Gemstone Warranty.

🛡️ Lifetime Gemstone Warranty — Your stones are protected forever.

⬆️ Lifetime Upgrade Program — Upgrade your stones or metal anytime.

✏️ Request a Custom Design — Make it uniquely yours.