Moissanite, lab-grown diamond, and cubic zirconia all sparkle — but they are three different materials with very different durability and price. Here is an honest, side-by-side look.
Quick comparison
| Property | Moissanite | Lab-Grown Diamond | Cubic Zirconia (CZ) |
|---|---|---|---|
| What it is | Silicon carbide (SiC) — its own gemstone and a diamond alternative | Real diamond (carbon), grown in a lab | Zirconium dioxide — a synthetic diamond simulant |
| Hardness (Mohs) | ~9.25 | 10 | ~8–8.5 |
| Brilliance & fire | More fire (rainbow flashes) than a diamond | Classic diamond sparkle | Less brilliance; can dull over time |
| Everyday durability | Excellent | Excellent | Lower — can scratch and cloud |
| Diamond tester | May read as diamond on some thermal testers; specialized testing distinguishes it | Reads as diamond (it is one) | Does not read as diamond |
| Relative price | Affordable | Highest of the three | Lowest |
Bottom line: for everyday sparkle that lasts without a fine-jewelry price, moissanite is the sweet spot — far more durable and brilliant than CZ, at a fraction of a lab-grown diamond's cost.
Moissanite
Moissanite is lab-created silicon carbide — its own gemstone, not a diamond. At about 9.25 on the Mohs scale it is extremely hard, and it actually throws more fire (those rainbow flashes) than a diamond. That combination of durability, brilliance, and low cost makes it ideal for everyday jewelry.
Lab-grown diamond
A lab-grown diamond is a real diamond (pure carbon) grown in a lab instead of mined. It is chemically identical to a mined diamond and is the hardest of the three at Mohs 10 — but it is also the most expensive by a wide margin.
Cubic zirconia (CZ)
Cubic zirconia is a synthetic diamond simulant made from zirconium dioxide. It is the most affordable option, but at Mohs ~8–8.5 it is softer than moissanite and tends to scratch and cloud over months of wear, losing its sparkle.
Which should you choose?
If you want a real diamond and budget is not the priority, choose a lab-grown diamond. If you want the most durable, most brilliant everyday sparkle for an affordable price, moissanite wins — and it far outlasts CZ. That is why every QIGE piece is set with lab-created moissanite in 925 sterling silver.
See it for yourself: browse moissanite rings, pendant necklaces, and stud earrings.
Ready to shop? Explore our sterling silver moissanite pieces.
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