Moissanite and lab-grown diamonds look similar in photos — both are brilliant, white, and far cheaper than natural diamonds. But they're fundamentally different stones. Here's the honest breakdown.
What Is Moissanite?
Moissanite is silicon carbide — a different mineral from diamond. It was originally discovered in a meteor crater; today it's created in labs. It's a beautiful stone in its own right, but it is not a diamond.
What Is a Lab-Grown Diamond?
A lab-grown diamond is pure carbon crystal — chemically, physically, and optically identical to a mined diamond. It is a diamond, just grown in a lab instead of the earth. See our lab-grown vs natural guide for the full story.
How They Compare
- Sparkle. Moissanite has higher dispersion ("fire") — it throws rainbow flashes, which some love and some find artificial-looking. Lab diamonds have the classic white brilliance of natural diamonds.
- Hardness. Diamond is 10 on the Mohs scale; moissanite is 9.25. Both are excellent for daily wear, but diamond is the hardest known material.
- Price. Moissanite is cheaper — often just a few hundred dollars per carat. Lab-grown diamonds cost more but deliver the real-diamond look and feel.
- Resale & perception. Lab-grown diamonds can be graded and certified by gemological laboratories, like natural diamonds. Moissanite is always moissanite — beautiful, but a different product.
- Color. Larger moissanite stones can show warm or greenish tints; lab diamonds are graded on the same color scale as natural stones.
Which Should You Choose?
Choose moissanite if budget is the top priority and you love rainbow fire. Choose a lab-grown diamond if you want a real diamond — identical to mined in every way that matters — at a fraction of the cost of natural. For an engagement ring you'll wear for decades, many shoppers choose lab-grown: all the prestige and beauty of diamond, none of the mining.
Explore lab-grown diamond jewelry and engagement rings at Mia Jewelry — and join our insider list for news and offers.