Brilliance and fire

Both moissanite and diamond are known for their sparkle, but they achieve it differently. Brilliance is measured by the refractive index: diamond scores 2.42, while moissanite scores 2.65. In practice, this means moissanite disperses slightly more light, producing more fire and rainbow flashes, especially in direct sunlight.

The difference is subtle. Side by side, most people cannot tell which is which without specialized equipment.

Hardness and durability

Diamond is the hardest known mineral, scoring a perfect 10 on the Mohs hardness scale. Moissanite is right behind it at 9.25 to 9.5, making it the second-hardest gemstone in the world.

What does this mean in daily life? Both stones are extremely resistant to scratching and chipping. Moissanite will not cloud, dull, or lose its brilliance over time. It is a stone you can wear every day for decades without worrying about damage.

Color and clarity

The moissanite used in quality jewelry today is D colorless with VVS1 clarity, meaning it has no visible color tint and virtually no inclusions. This is the highest grade available, and with moissanite, it is the standard grade. Every stone meets the same high benchmark, regardless of size or budget.

Price

This is where the two stones diverge most. A moissanite of comparable size and visual quality costs significantly less than a diamond. The savings are meaningful enough that many buyers choose to invest the difference in a higher-quality metal setting, a more elaborate design, or simply keep the extra budget for other priorities.

Lab-created moissanite is produced under controlled conditions without the mining, distribution, and certification costs that drive diamond pricing. The result is a gemstone with comparable brilliance and hardness at a much more accessible price point.