If you have ever looked at a piece of fashion jewellery and thought the crystal stones looked remarkably like diamonds, you were probably looking at cubic zirconia. CZ is the most widely used gemstone in fashion accessories worldwide — and for good reason. Here is the complete honest guide to understanding it.
What Is Cubic Zirconia?
Cubic zirconia (CZ) is a synthesised crystalline form of zirconium dioxide. It does not occur naturally to any significant extent — virtually all CZ is laboratory-created. The production process involves melting zirconium oxide powder with stabilising agents at temperatures above 2,700°C, then slowly cooling the material to allow crystal growth. The result is a hard, clear, optically brilliant crystal with properties engineered to closely resemble diamonds.
How Similar Is CZ to a Diamond?
Remarkably similar. The refractive index of CZ (2.15–2.18) is close to diamond (2.42), meaning it bends and disperses light in a similar way — producing the characteristic sparkle. To the naked eye, a well-cut high-quality CZ is indistinguishable from a diamond without specialist equipment. The main optical difference is that CZ actually shows more colour dispersion (the rainbow fire) than a diamond — which some people prefer.
The Key Differences: Hardness and Durability
On the Mohs hardness scale, diamond scores 10 (the maximum). CZ scores 8–8.5 — harder than most gemstones, but softer than diamond. In practical terms, this means CZ can scratch over time with heavy daily wear, particularly if it comes into contact with abrasive surfaces. For fashion jewellery worn occasionally or rotated regularly, this is rarely noticeable. For a ring worn every single day for decades, a natural gemstone holds up better long-term.
AAA Grade CZ: What Does It Mean?
CZ is graded A through AAAAA (five-A), though there is no universal industry standard. AAA grade CZ — the most common grade used in quality fashion jewellery — is hand-cut, machine-polished, and free of visible inclusions or cloudiness. It has excellent clarity, precise faceting, and consistent optical performance. Our Crystal Statement Ring uses AAA grade cubic zirconia for maximum brilliance.
The Sustainability Argument
This is increasingly important for European consumers. Natural diamond mining carries well-documented environmental and ethical concerns — habitat destruction, water usage, and labour issues in some producing regions. CZ is laboratory-produced with a fraction of the environmental footprint. For fashion-conscious consumers in Sweden and across Europe who care about sustainability, CZ is an ethically straightforward choice.
The Price Reality
A one-carat diamond of good quality costs €3,000–€10,000. A one-carat equivalent CZ costs under €5. This 99%+ price difference means CZ jewellery can be made accessible at any price point — from affordable everyday accessories to spectacular statement pieces — without compromising the visual impact.
The Bottom Line
CZ is not trying to deceive anyone. It is an honest, brilliant, sustainable, and affordable material that has democratised the sparkle of gemstone jewellery. For fashion accessories, crystal jewellery, and statement pieces, it is simply the right material — beautiful, ethical, and accessible.