Moissanite and Diamond are both popular gemstones, but they have some key differences

Moissanite and diamond are both popular gemstones, but they have some key differences:


  • Composition: Made of silicon carbide (SiC).
  • Hardness: 9.25 on the Mohs scale, making it very hard and durable but slightly less so than diamonds.
  • Brilliance: Exhibits a higher refractive index (2.65 - 2.69) than diamond, resulting in more brilliance and fire (sparkle).
  • Color: Naturally occurring moissanite is very rare and typically synthesized in laboratories. It can come in a range of colors, but is often near-colorless.
  • Price: Generally, more affordable than diamonds of similar size and quality.
  • Origins: Mostly lab-created.


  • Composition: Pure carbon (C) in a crystal structure.
  • Hardness: 10 on the Mohs scale, the hardest natural material.
  • Brilliance: Refractive index is 2.42, which provides excellent brilliance and fire.
  • Color: Ranges from colorless to various shades. Colorless diamonds are the most sought after.
  • Price: Generally, more expensive, especially for high-quality stones.
  • Origins: Can be mined (natural diamonds) or created in a lab (synthetic diamonds).

Key Differences

  • Brilliance and Fire: Moissanite has more fire and brilliance due to its higher refractive index.
  • Cost: Moissanite is less expensive.
  • Hardness: Diamond is harder.
  • Origins: Moissanite is usually lab-created, while diamonds can be natural or lab-created.
  • Ethics and Environmental Impact: Lab-created moissanite and diamonds tend to have a lower environmental impact and ethical concerns compared to mined diamonds.

Choosing between moissanite and diamond depends on personal preferences, budget, and values related to sustainability and ethics.