Is Moissanite a Real Gemstone? The Definitive Scientific Answer

It is one of the most Googled questions in the jewelry world, and it deserves a straight answer: is moissanite a real gemstone? The short answer is yes — unambiguously, scientifically, and by every standard definition used in gemology. But the longer answer is more interesting, and understanding it will change how you think about gemstones entirely.

What Makes a Gemstone "Real"?

The word "real" in the context of gemstones is often used loosely — and that looseness creates confusion. In gemology, a gemstone is defined as a mineral (or occasionally an organic material) that is valued for its beauty, durability, and rarity. By this definition, moissanite qualifies completely:

• It is a mineral: Moissanite is silicon carbide (SiC) — a naturally occurring mineral compound with a defined crystal structure, chemical formula, and physical properties.
• It is beautiful: Moissanite has a higher refractive index than diamond (2.65–2.69 vs. 2.42) and a higher dispersion rate (0.104 vs. 0.044), producing more fire and brilliance than any other gemstone used in jewelry.
• It is durable: At 9.25 on the Mohs hardness scale, moissanite is the second hardest gemstone used in jewelry, after diamond.

By every objective measure, moissanite is a real gemstone. The confusion arises from two sources: its lab-created origin and its frequent comparison to diamond.

Natural vs. Lab-Created: Does Origin Determine "Realness"?

This is the crux of the question for most people. Moissanite sold in jewelry today is lab-created — produced in controlled laboratory conditions rather than mined from the earth. Does that make it less "real"?

The answer, according to the Federal Trade Commission (FTC) and the gemological community, is no. The FTC updated its jewelry guidelines to clarify that lab-created gemstones are not "fake" or "simulated" — they are real gemstones with the same chemical composition, crystal structure, and physical properties as their natural counterparts. A lab-created ruby is a real ruby. A lab-created sapphire is a real sapphire. And lab-created moissanite is a real moissanite.

Natural moissanite does exist — it was first discovered in 1893 by Nobel Prize-winning chemist Henri Moissan inside a meteorite crater in Canyon Diablo, Arizona. It is extraordinarily rare in nature, found only in minute quantities in meteorites and certain rock formations. The moissanite in your jewelry is chemically and optically identical to that natural mineral — just produced more efficiently.

Is Moissanite a Diamond Simulant?

This is where the terminology gets important. A diamond simulant is a stone that looks like a diamond but has a different chemical composition — cubic zirconia (CZ) is the most common example. Moissanite is sometimes called a diamond simulant because it is colorless and brilliant, and is often chosen as a diamond alternative. But this label is technically imprecise.

Moissanite is not pretending to be diamond. It is its own gemstone — silicon carbide, not carbon — with its own distinct optical properties, its own grading standards, and its own identity. As we explain in our Moissanite vs. CZ comparison, the difference between moissanite and a true simulant like CZ is enormous in terms of hardness, brilliance, and longevity.

What Is Moissanite Made Of?

Moissanite is silicon carbide — a compound of silicon and carbon atoms arranged in a crystal lattice structure. In its natural form, it is one of the rarest minerals on earth. In its lab-created form, it is grown using a process called physical vapor transport (PVT), in which silicon and carbon are combined under controlled high-temperature conditions to form large, high-quality crystals that are then cut and polished into gemstones.

The result is a stone that is chemically pure, optically consistent, and free from the inclusions and color variations that affect naturally mined stones. Every moissanite from Moissanite Shine is D-color (colorless) and VVS1 clarity — the highest grades available — and comes with a GRA Certificate documenting those specifications.

How Does Moissanite Compare to Diamond Scientifically?

Moissanite and diamond are both carbon-based in part (diamond is pure carbon; moissanite is silicon carbide), but they are distinct minerals with different properties:

• Hardness: Diamond 10, Moissanite 9.25
• Refractive Index: Diamond 2.42, Moissanite 2.65–2.69
• Dispersion (fire): Diamond 0.044, Moissanite 0.104
• Thermal conductivity: Diamond is higher — which is why moissanite can fool some basic diamond testers

For a full scientific comparison, read our Moissanite vs. Diamond guide.

Will a Jeweler Know It Is Moissanite?

Yes — a trained gemologist with the right equipment will identify moissanite as moissanite, not diamond. Moissanite has a characteristic doubling of facet edges visible under magnification (due to its double refractive nature), and dedicated moissanite testers can distinguish it from diamond electronically. This is not a flaw — it is simply what moissanite is. Read our article on What Happens When a Jeweler Tests Your Moissanite for a complete walkthrough.

Does "Lab-Created" Mean Lower Quality?

In the case of moissanite, the opposite is true. Lab creation allows for precise control over the growth conditions, resulting in stones that are consistently D-color and VVS1 clarity — grades that are extremely rare in naturally mined colored gemstones. There are no inclusions, no color zoning, no treatment history. The lab origin is a quality advantage, not a compromise.

The Bottom Line

Moissanite is a real gemstone — a naturally occurring mineral compound that is now produced in laboratories to deliver consistent, top-grade quality at scale. It is not a fake diamond, not a simulant in the pejorative sense, and not a lesser stone. It is its own gemstone with its own identity, its own optical properties, and its own compelling story.

If you are considering moissanite and want to understand everything about it before you buy, start with our complete Moissanite guide. And when you are ready to see the brilliance for yourself, browse our full collection.