Lab-Grown Diamonds vs. Moissanite 2026

Lab-Grown Diamonds vs. Moissanite: Choosing Your Perfect Sparkle

When designing a bespoke engagement ring, one of the most frequent questions we receive at our Wembley showroom is: "What is the difference between a lab-grown diamond and a moissanite?"

While both offer a stunning, ethical alternative to mined stones, they are entirely different minerals with unique optical properties. As gemologists, we believe the "best" choice depends on what you value most in your jewellery.

1. The Sparkle (Brilliance vs. Fire)

The most noticeable difference lies in how these stones handle light.

• Lab-Grown Diamonds have a "refractive index" that produces a classic, sophisticated balance of white light (brilliance) and rainbow flashes (fire). It is the iconic "diamond look" recognized worldwide.

• Moissanite is "doubly refractive," meaning it has over twice the "fire" of a diamond. This results in a "disco-ball" effect with intense colorful flashes. If you love a high-impact, high-sparkle look, moissanite is a breathtaking choice.

2. Durability and Longevity

An engagement ring is a lifelong piece, so durability is paramount.

• Diamonds are the hardest known substance, ranking a 10 on the Mohs scale. They are essentially scratch-proof.

• Moissanite ranks at 9.25. While incredibly durable and suitable for daily wear, it is slightly softer than a diamond. However, it far outperforms stones like sapphire or emerald in terms of longevity.

3. Price and Value

Both options provide exceptional value compared to mined diamonds, allowing you to prioritize size and quality.

• Lab-Grown Diamonds are priced based on the "4Cs" (Cut, Color, Clarity, and Carat) and offer the prestige of a genuine diamond at a fraction of the traditional cost.

• Moissanite is generally the most budget-friendly option, allowing for significant carat weights while maintaining an ethical, conflict-free origin.

How to Decide?

If you want the timeless heritage and peerless hardness of a diamond, a lab-grown diamond engagement ring is your perfect match. If you prefer a more fiery, colorful sparkle and want to maximize your budget, moissanite is an incredible alternative.

Experience the Difference in Person

The best way to choose is to see the stones side-by-side. We invite you to book a consultation at our Perth showroom to view our collection in person.

If you aren't based in WA, you can vote for a Diamond Lab pop-up in your city, or explore our ready-to-ship engagement rings online.

Whether you choose the classic diamond or the vibrant moissanite, our custom jewellery design service is here to bring your vision to life.