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MoissaniteVSColorless Zircon (High Type)
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
- ◎ is higher in Moissanite, giving a numerical distinguishing point.
- ◎ is higher in Colorless Zircon (High Type), giving a numerical distinguishing point.
- ◎ is higher in Moissanite, giving a numerical distinguishing point.
- ◎ is higher in Moissanite, giving a numerical distinguishing point.
- ◎ is higher in Moissanite, giving a numerical distinguishing point.
Note: properties whose numeric ranges do not overlap are auto-extracted. Both are measurable with a refractometer or heavy-liquid bath.
| Property | A: Moissanite | B: Colorless Zircon (High Type) | Verdict |
|---|---|---|---|
| Refractive index (RI) | 2.648–2.691 | 1.925–1.984 | A higher |
| Specific gravity (SG) | 3.20–3.22 | 4.60–4.80 | B higher |
| Mohs hardness | 9.3 | 7.5 | A higher |
| Birefringence | 0.043 | 0.039 | A higher |
| Dispersion | 0.104 | 0.039 | A higher |
| Property | A: Moissanite | B: Colorless Zircon (High Type) |
|---|---|---|
| Crystal system | 六方晶系 | 正方晶系 |
| Pleochroism | — | — |
| Chelsea filter | inert | inert |
| UV (long-wave) | weak (orange) | weak (yellow) |
| UV (short-wave) | inert | weak (yellow) |
◆Natural zircon (ZrSiO₄, RI 1.92–1.98, SG 4.7, 0.039, acet diagnostic of zircon's even stronger . Moissanite's combined thermal/electrical conductivity test reads 'moissanite' positively where zircon reads 'not diamond, not moissanite.' Moissanite's hardness (9.25) far exceeds zircon's 7.5, giving noticeably better long-term wear retention.
Distinguishing tools
Tools that decide between Moissanite and Colorless Zircon (High Type) in practice.
Note: this page is auto-generated from published GIA / CGL reference values. Individual stones, treatments, and synthetics may fall outside these ranges. For a definitive identification, consult an accredited gem laboratory.