If you're shopping beyond mined diamonds, two names come up constantly: lab-grown diamonds and moissanite. They're often mentioned in the same breath, but they're fundamentally different things. Here's a clear, honest comparison.
The core difference
A lab-grown diamond is a real diamond — pure carbon, grown in a lab. Moissanite is not a diamond — it's silicon carbide, a different material that happens to look diamond-like. Moissanite is a beautiful, durable gemstone in its own right, but it is a diamond alternative, not a diamond.
How they compare
- Hardness — Diamond (lab-grown or natural) is 10 on the Mohs scale, the hardest there is. Moissanite is 9.25 — very hard and durable, but a notch below.
- Sparkle — Moissanite has more fire (the rainbow flashes) than diamond, which some people love and others find too flashy — it can give a "disco-ball" effect in larger sizes. A diamond's sparkle is a balance of white brilliance and fire that most people read as more classic.
- Color — High-quality moissanite is near-colorless, though some stones show a faint yellow or green tint in certain light. A near-colorless lab-grown diamond reads cleanly white.
- Price — Moissanite is the most affordable of the three (typically less than lab-grown), and lab-grown is far less than natural.
- Certification — Diamonds are graded on the universal 4Cs by the GIA or IGI. Moissanite isn't graded on that scale (it's a different material), so quality comparison is less standardized.
Which should you choose?
- Choose a lab-grown diamond if you want a real diamond — the same material as a mined stone — at a large discount, with universal certification and resale recognition as a diamond. Explore our lab-grown diamonds.
- Consider moissanite if your top priority is the lowest price and you love extra fire, and you're comfortable with a stone that's a diamond alternative rather than a diamond.
For most people choosing an engagement ring, a lab-grown diamond is the sweet spot: a genuine diamond, certified, durable for daily wear, at a fraction of the natural price.
Common questions
Can people tell moissanite from a diamond?
Sometimes — in larger sizes, moissanite's extra fire can be noticeable to a trained eye. Lab-grown diamonds, being real diamonds, are visually indistinguishable from natural ones.
Is moissanite a good engagement ring stone?
It's durable and affordable, so it can be. Just know you're choosing a diamond alternative, not a diamond — which matters for some buyers and not others.
Want the real thing for less? Browse our certified lab-grown and natural diamonds.