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Moissanite vs Cubic Zirconia: What Is the Real Difference?
Quick Answer: Moissanite and cubic zirconia (CZ) are very different. Moissanite is a genuine gemstone rated 9.25 on the Mohs scale that keeps its sparkle for life. CZ is an inexpensive simulant rated about 8 to 8.5, with lower brilliance, and it tends to scratch and turn cloudy over time. Moissanite costs more but is built to last a lifetime.
Key Takeaways
- Moissanite is harder, more brilliant and longer-lasting than CZ.
- CZ is best for low-cost fashion jewelry; moissanite for fine jewelry.
- CZ is noticeably heavier than moissanite for the same size.
Moissanite vs CZ at a Glance
| Moissanite | Cubic zirconia | |
|---|---|---|
| Material | Silicon carbide | Zirconium dioxide |
| Type | Genuine gemstone | Diamond simulant |
| Mohs hardness | 9.25 | About 8 to 8.5 |
| Refractive index | About 2.65 to 2.69 | About 2.15 to 2.18 |
| Long-term look | Stays brilliant | Can scratch and cloud |
| Best for | Engagement rings and fine jewelry | Budget fashion jewelry |
Brilliance
Moissanite's much higher refractive index means it returns far more light, giving a bright, lively sparkle. CZ can look sparkly when new, but it has noticeably less brilliance side by side.
Durability
Because CZ is softer, everyday wear leaves fine scratches that dull its surface over time, which is why CZ often looks cloudy after a few years. Moissanite's hardness keeps its facets sharp and bright.
Which Should You Choose?
For an engagement ring or any piece you want to wear for years, moissanite is the better long-term choice. CZ is fine for trend pieces or costume jewelry.
Shop moissanite engagement rings or read 8 Moissanite Myths Debunked.
Frequently Asked Questions
Is moissanite better than cubic zirconia?
Yes, for fine jewelry. Moissanite is harder, more brilliant, and keeps its sparkle for life, while CZ can scratch and cloud over time.
Does cubic zirconia get cloudy?
Over time, yes. Because CZ is softer, fine scratches and wear can make it look cloudy. Moissanite does not.
Can you tell moissanite from cubic zirconia?
Yes. Moissanite is noticeably more brilliant, and CZ feels heavier for its size. Gem testers also distinguish them easily.