Moissanite vs Lab Diamond: The 2027 Price Gap Explained

August 25, 2026

The lab-grown diamond market has undergone a dramatic transformation over the past several years. Lab diamond prices — which were already significantly lower than mined diamond prices — have continued to fall sharply as production capacity has expanded and competition has intensified. Meanwhile, moissanite prices have remained relatively stable. Understanding the current price gap between moissanite and lab diamonds — and what it means for buyers — is essential for making an informed engagement ring decision in 2027.

The Lab Diamond Price Collapse: What Happened

Lab-grown diamonds are produced using two primary methods: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD). Both methods have become significantly more efficient and less expensive over the past decade, and production capacity has expanded dramatically — particularly in India and China, where large-scale lab diamond production facilities have come online.

The result has been a sustained and significant decline in lab diamond prices. A 1-carat lab-grown diamond that sold for $3,000–$4,000 several years ago now sells for $800–$1,500 at retail — a decline of 50–75%. Some industry analysts project continued price declines as production capacity continues to expand and competition intensifies.

This price collapse has significant implications for buyers who purchased lab diamonds as "investments" — the resale value of lab diamonds has declined even more sharply than retail prices, and the market for pre-owned lab diamonds is extremely thin.

The Current Price Gap: Moissanite vs. Lab Diamond

As of 2027, the price gap between moissanite and lab-grown diamonds has narrowed significantly compared to several years ago, but moissanite remains substantially less expensive:

1-carat equivalent moissanite (DEF, VVS1, Excellent cut, GRA certified): Approximately $400–$700
1-carat lab-grown diamond (D, VS1, Excellent cut, IGI certified): Approximately $800–$1,500
Price gap: Moissanite is approximately 40–60% less expensive than a comparable lab diamond

2-carat equivalent moissanite (DEF, VVS1, Excellent cut, GRA certified): Approximately $700–$1,200
2-carat lab-grown diamond (D, VS1, Excellent cut, IGI certified): Approximately $2,000–$4,000
Price gap: Moissanite is approximately 60–75% less expensive at larger sizes

Optical Performance: The Key Difference

Despite the narrowing price gap, moissanite and lab-grown diamonds remain optically distinct stones:

Refractive index: Lab diamond: 2.42 | Moissanite: 2.65–2.69 (moissanite is more brilliant)
Dispersion (fire): Lab diamond: 0.044 | Moissanite: 0.104 (moissanite has more fire)
Hardness: Lab diamond: 10.0 Mohs | Moissanite: 9.25 Mohs (diamond is harder, but both are scratch-resistant for daily wear)
Double refraction: Lab diamond: none | Moissanite: yes (visible under magnification)

For buyers who want the optical properties of diamond specifically — including the absence of double refraction — a lab-grown diamond is the appropriate choice. For buyers who want maximum brilliance and fire at the lowest possible price, moissanite remains the superior value.

The Resale Value Question

Neither moissanite nor lab-grown diamonds have significant resale value. Lab diamond resale values have declined sharply as retail prices have fallen — a pre-owned lab diamond typically sells for 10–20% of its original retail price, if it can be sold at all. Moissanite has always had minimal resale value, and this has been consistently communicated to buyers.

For buyers who are concerned about resale value, neither stone is an appropriate choice. For buyers who understand that an engagement ring is a personal purchase rather than an investment, both stones offer extraordinary visual value at a fraction of mined diamond's cost.

Which Should You Choose?

Choose moissanite if: You want maximum brilliance and fire, you want the lowest possible price, you appreciate moissanite's distinct optical character, and you're comfortable with a stone that is not a diamond.
Choose a lab diamond if: You specifically want a diamond (with diamond's optical properties and the absence of double refraction), you're willing to pay the premium for diamond's specific characteristics, and you understand that lab diamond prices may continue to decline.

Both are ethical, lab-created choices. Both are beautiful. The right choice depends on your priorities — and we're happy to help you think through them. Contact us at our contact page.

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