Swarovski Crystal vs Diamond vs Cubic Zirconia vs Moissanite
Crystal, diamond, cubic zirconia and moissanite all sparkle — but they are fundamentally different materials with different properties, different lifespans and different price points. As authorised Swarovski stockists, we explain this distinction daily. This guide breaks down exactly what each one is, how they compare on hardness and brilliance, and which suits your needs.
What Is Swarovski Crystal?
Swarovski crystal is precision-cut crystal glass manufactured using a proprietary formula developed by Daniel Swarovski in 1895. It is not a gemstone. It is not a diamond. It is high-lead-content glass, machine-cut to exact geometric tolerances that produce exceptional light refraction.
The brilliance comes from the cut, not the material. Swarovski's patented cutting technology achieves facet angles that maximise rainbow dispersion — the same principle that makes a well-cut diamond sparkle, applied to glass. The result is a material that catches light dramatically at an accessible price point.
Mohs hardness: approximately 6–7 (can be scratched by harder materials, including sand and quartz dust).
What Is a Diamond?
A diamond — whether mined or laboratory-grown — is crystallised carbon with a Mohs hardness of 10, the hardest natural material on earth. It cannot be scratched by any other gemstone.
Swarovski also produces a separate laboratory-grown diamond line under the Created Diamonds name. This is distinct from their crystal jewellery collections and is not part of OD's current Swarovski range.
What Is Cubic Zirconia (CZ)?
Cubic zirconia is a synthetic crystalline material — zirconium dioxide — designed specifically as a diamond simulant. It has a Mohs hardness of 8–8.5, making it significantly harder than Swarovski crystal but softer than diamond.
CZ has a refractive index of 2.15–2.18, which produces strong brilliance but slightly less fire than diamond. The main drawback is longevity: cubic zirconia tends to cloud and develop surface micro-scratches over time, gradually losing its sparkle. A well-maintained CZ piece will look noticeably duller after 2–5 years of regular wear compared to a diamond or moissanite equivalent.
What Is Moissanite?
Moissanite is silicon carbide, originally discovered in meteorite fragments and now produced synthetically. It sits at 9.25 on the Mohs scale — harder than CZ, softer than diamond — and has a refractive index of 2.65, which is actually higher than diamond.
That higher refractive index produces distinctive rainbow fire: moissanite disperses light into colour more aggressively than diamond. Some buyers love this; others find it looks "too sparkly" compared to the white brilliance of a well-cut diamond. It does not cloud over time like CZ.
Direct Comparison
| Property | Swarovski Crystal | Cubic Zirconia | Moissanite | Diamond |
|---|---|---|---|---|
| Material | Crystal glass | Zirconium dioxide | Silicon carbide | Crystallised carbon |
| Mohs Hardness | 6–7 | 8–8.5 | 9.25 | 10 |
| Refractive Index | ~1.5 | 2.15–2.18 | 2.65 | 2.42 |
| Durability | Can chip or scratch | Clouds over time | Excellent long-term | Permanent |
| Fire / Dispersion | Rainbow refraction | Strong brilliance | Intense rainbow fire | White brilliance |
| Price Position | Accessible | Budget | Mid-range | Premium |
Which Should You Choose?
Swarovski crystal suits fashion jewellery, statement pieces and trend-led designs where dramatic sparkle matters more than gemstone permanence. It's designed to be accessible and collectible — worn for a season or a decade, depending on care.
Cubic zirconia works as a short-to-medium-term diamond alternative, but be aware it will lose clarity over time.
Moissanite is the strongest diamond alternative for daily wear — nearly as hard, with superior fire, and no clouding.
Diamond — mined or lab-grown — remains the benchmark for permanence.
Top Picks at OD's — In Stock Now
Three best-sellers our customers are choosing this month — all in stock, ready to ship from St Helens, available to try in our St Helens store before you buy.
All available in-store at 41 Barrow Street, St Helens, WA10 1RY — try before you buy.
Browse the full jewellery range at OD's.
Frequently Asked Questions
Are Swarovski crystals real diamonds?
No. Swarovski crystals are precision-cut crystal glass. They are not diamonds, not cubic zirconia and not gemstones. Swarovski produces a separate Created Diamonds line, but this is a distinct product range from their crystal jewellery.
Is cubic zirconia better than Swarovski crystal?
CZ is harder (Mohs 8–8.5 vs 6–7) and has a higher refractive index, making it a closer diamond simulant. However, CZ clouds over time while Swarovski crystal maintains its appearance with proper care. "Better" depends on whether you prioritise hardness or design versatility.
Will moissanite pass a diamond tester?
Some moissanite will pass basic thermal diamond testers because silicon carbide has high thermal conductivity. Advanced testers that measure electrical conductivity can distinguish moissanite from diamond.
Can you tell the difference between Swarovski crystal and diamond?
Yes. Swarovski crystal produces broader rainbow light dispersion, weighs less than diamond, and feels warmer to the touch. A jeweller can distinguish them immediately. To the untrained eye at arm's length, a well-cut Swarovski crystal catches light impressively — but under close inspection, the difference in fire, weight and thermal properties is clear.
What Swarovski collections does OD's carry?
OD's Jewellers is an authorised Swarovski stockist carrying crystal jewellery collections including Millenia, Matrix, Dextera and seasonal ranges. Browse current stock via our Swarovski collection or visit us in-store.
Read more: OD's Swarovski Brand Guide — full heritage, collections, sizing and care reference.
Related: Jewellery Care Guide | Shop Swarovski | Size Guide
Published: March 2026 · Author: Chris O'Dea · OD's Jewellers, 41 Barrow Street, St Helens, WA10 1RY
