When it comes to sparkling gemstones, lab-grown diamonds often get compared to popular diamond simulants such as moissanite and cubic zirconia (CZ). While all these stones have their own beauty and appeal, they are fundamentally different. Understanding these differences helps consumers make the right choice for their needs and budgets.
Lab-Grown Diamonds vs. Moissanite
What is Moissanite? Moissanite is a gemstone made of silicon carbide. It is prized for its brilliance and fire but is chemically and optically different from a diamond.
- Composition: Lab-grown diamonds are pure carbon, identical to natural diamonds. Moissanite has a completely different structure.
- Brilliance: Moissanite tends to have rainbow-like fire, while diamonds deliver classic white brilliance.
- Hardness: Lab-grown diamonds score 10 on the Mohs scale, moissanite 9.25.
- Price: Moissanite is typically more affordable but has lower long-term resale value.
Lab-Grown Diamonds vs. Cubic Zirconia (CZ)
What is CZ? Cubic zirconia is a synthetic stone made from zirconium dioxide, designed to imitate diamonds at a fraction of the cost.
- Appearance: CZ may look similar to diamonds initially but tends to lose its sparkle over time and can develop scratches.
- Hardness: CZ scores 8–8.5 on the Mohs scale, making it more prone to scratches than lab-grown diamonds.
- Weight & Feel: CZ is heavier than diamonds of the same size and feels different when set in jewelry.
- Value: CZ has little to no resale value, while lab-grown diamonds retain value similar to their natural counterparts.
Durability, Brilliance, and Market Value
Lab-grown diamonds are as durable as natural diamonds, perfect for everyday wear. Moissanite is durable but not as hard, and CZ is softer and prone to damage. In terms of brilliance, lab-grown diamonds offer classic white sparkle, moissanite produces rainbow flashes, and CZ loses brilliance more quickly. From a market perspective, lab-grown diamonds carry gem value and certification, while simulants are mostly fashion jewelry.
Consumer Experiences
“My lab-grown diamond engagement ring is stunning and certified — I love that it’s sustainable and long-lasting.”
“Moissanite gave me a big look for less, but I notice the rainbow sparkle isn’t for everyone.”
“CZ is fine for casual wear, but it scratches easily and loses brilliance.”
Comparison Overview
How to Choose the Right Stone
- Budget: For maximum sparkle at a lower price, moissanite can be a good choice.
- Longevity & Value: For heirloom-quality jewelry, lab-grown diamonds are best.
- Purpose: For fashion jewelry, CZ is an inexpensive short-term option.
Conclusion
Lab-grown diamonds stand out from simulants like moissanite and cubic zirconia thanks to their unmatched hardness, authentic diamond brilliance, and long-term value. While simulants have their place, those seeking genuine diamond beauty and durability often find lab-grown diamonds the perfect choice.