Diamond vs Moissanite: Side-by-Side Comparison

Category: Comparison Articles  |  Published: 2026-05-03  |  Author: Psiroy Jewelry

What Is Moissanite?

Moissanite was first discovered in 1893 by French chemist Henri Moissan, who found it in a meteorite crater in Arizona. Naturally occurring moissanite is extraordinarily rare—so rare that virtually all moissanite used in jewelry today is lab-created. Chemically, moissanite is silicon carbide, a compound that occurs naturally in meteorites and is now synthesized in controlled laboratory environments.

Visual Differences: Can You Tell?

To the naked eye, high-quality moissanite and diamond look remarkably similar—both are colorless (when graded), both sparkle brilliantly, and both are set in standard jewelry mountings. Under magnification, the differences are immediately apparent: moissanite has a higher refractive index and produces more colorful light flashes (excessive fire), while diamond has a more refined, subtle brilliance. Moissanite also has doubling of facets when viewed through the crown.

Hardness and Durability

On the Mohs hardness scale, moissanite scores 9.25—second only to diamond at 10. This makes moissanite extremely durable and suitable for everyday wear in engagement rings and other frequently-worn jewelry. Both stones will last a lifetime with normal care. Moissanite does not scratch easily and maintains its polish well over time.

Environmental and Ethical Considerations

Both lab-grown diamonds and moissanite are ethical choices compared to mined diamonds. However, moissanite production generally has a smaller environmental footprint than diamond mining or even diamond lab-growing, requiring less energy and resources. For consumers prioritizing sustainability, moissanite is among the most responsible gemstone choices available.

Price: The Dramatic Difference

A one-carat diamond of decent quality costs $3,000 to $7,000 or more. A comparable moissanite stone costs $300 to $600. A two-carat moissanite—the size that would cost $15,000+ in diamond—runs $600 to $1,200. This price difference allows buyers to choose larger, higher-quality stones than they could afford in diamond.

Comparison Table

Property	Diamond	Moissanite
Chemical Composition	Carbon	Silicon Carbide
Mohs Hardness	10	9.25
Refractive Index	2.42	2.65-2.69
Fire (Light Dispersion)	Low-Moderate	High (more rainbow)
Faceting Doubling	No	Yes (visible under loupe)
1 Carat Price (avg)	$3,000-$10,000+	$300-$600
Origin Options	Natural or Lab	Lab only

Frequently Asked Questions

Does moissanite look like a diamond?

High-quality moissanite looks very similar to a diamond to the untrained eye. Under magnification or bright light, the more colorful fire and faceting doubling become visible.

Is moissanite a conflict-free choice?

Yes. Lab-created moissanite is completely conflict-free and has minimal environmental impact compared to mined diamonds.

Will moissanite turn yellow or cloudy over time?

High-quality moissanite is stable and will not change color or become cloudy with normal wear.

Can you tell the difference between moissanite and diamond?

A trained jeweler can identify moissanite instantly using magnification (looking for doubling of facets and higher fire). Most consumers cannot distinguish between the two without tools.

Is moissanite a good engagement ring stone?

Moissanite is an excellent engagement ring stone—it is hard, beautiful, ethical, and significantly more affordable than diamond.

Looking for high-quality jewelry to match your style? Explore the full collection at Psiroy.com.