Zircon vs Cubic zirconia
Cubic zirconia is harder (Mohs 8–8.5) than Zircon (Mohs 6.5–7.5), so it resists scratching better; Zircon is softer than quartz dust (7) and needs more care in everyday rings.
Cubic zirconia has the higher refractive index (2.15–2.18 vs 1.925–1.984), which a refractometer (over-the-limit reading) can use to separate them.
Cubic zirconia is denser (SG 5.8 vs 4.69); a cubic zirconia of the same size weighs about 24% more.
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| Property | Zircon | Cubic zirconia |
|---|---|---|
| Species / material | Zircon | Synthetic zirconium oxide |
| Mohs hardness | 6.5–7.5 | 8–8.5 |
| Refractive index | 1.925–1.984 | 2.15–2.18 |
| Specific gravity | 4.69 | 5.8 |
| Crystal system | Tetragonal | Cubic |
| Birefringence | 0.059 | None (isotropic) |
Values are typical ranges from standard gemmological references; individual stones can vary.
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