Introduction
When choosing a gemstone for fine jewelry, moissanite and diamond are two of the most popular options. But they're very different stones — in origin, appearance, price, and value. This guide breaks down everything you need to know so you can make an informed choice.
What Is Moissanite?
Moissanite is a gemstone originally discovered in a meteor crater in 1893 by French chemist Henri Moissan. Natural moissanite is extraordinarily rare — virtually all moissanite available today is lab-grown, making it a sustainable and ethical choice. Lab-grown moissanite has the same chemical composition (silicon carbide, SiC) as natural moissanite, with consistent quality and clarity.
What Is a Diamond?
Diamond is a naturally occurring gemstone made of pure carbon, formed deep within the Earth over billions of years. Diamonds are also available as lab-grown stones. They are the hardest natural material on Earth (10 on the Mohs scale) and have long been the traditional choice for engagement rings and fine jewelry.
Moissanite vs Diamond: Key Differences
| Property | Moissanite | Diamond |
|---|---|---|
| Composition | Silicon carbide (SiC) | Carbon (C) |
| Hardness (Mohs) | 9.25 | 10 |
| Brilliance (refractive index) | 2.65–2.69 | 2.42 |
| Fire (dispersion) | 0.104 (higher) | 0.044 |
| Price | Significantly lower | Much higher |
| Origin | Lab-grown | Mined or lab-grown |
| Ethical sourcing | Always conflict-free | Varies |
Brilliance and Fire: Does Moissanite Sparkle More?
One of the most striking differences is brilliance. Moissanite has a higher refractive index than diamond (2.65–2.69 vs 2.42), meaning it bends light more and produces more sparkle. Moissanite also has significantly more fire — the rainbow flashes of color you see in a gemstone. Some buyers love this; others prefer the more subdued sparkle of a diamond. In bright light, moissanite's fire is especially vivid.
Hardness and Durability
Diamond scores a perfect 10 on the Mohs hardness scale — the hardest natural material known. Moissanite scores 9.25, making it the second hardest gemstone used in jewelry. For everyday wear in rings, earrings, or pendants, moissanite is extremely durable and resistant to scratching. For jewelry makers, both stones are excellent choices for long-lasting pieces.
Price: The Biggest Practical Difference
This is where moissanite truly stands out. A high-quality moissanite stone can cost 80–90% less than a comparable diamond. For jewelry makers, this means you can create stunning, high-quality pieces at a fraction of the cost — or offer your customers more stone for their budget.
Ethics and Sustainability
All moissanite is lab-grown, meaning it is always conflict-free and has a significantly lower environmental footprint than mined diamonds. For buyers who care about ethical sourcing, moissanite is a clear choice.
Which Should You Choose?
- Choose moissanite if you want maximum brilliance, ethical sourcing, and exceptional value.
- Choose diamond if you want the hardest gemstone and prefer a traditional choice.
For jewelry makers working with loose stones, moissanite offers outstanding quality, consistency, and value — making it the preferred choice for many professional jewelers.
Shop Loose Moissanite Stones
Browse our collection of visually inspected, high-quality loose lab-grown moissanite stones — available in a range of cuts, sizes, and shapes for your jewelry projects.