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Red Zircon (Hyacinth)VSRubellite
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
- ◎ is higher in Red Zircon (Hyacinth), giving a numerical distinguishing point.
- ◎ is higher in Red Zircon (Hyacinth), giving a numerical distinguishing point.
- ◎ is higher in Red Zircon (Hyacinth), 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: Red Zircon (Hyacinth) | B: Rubellite | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.925–1.984 | 1.624–1.644 | A higher |
| Specific gravity (SG) | 4.60–4.80 | 3.04–3.10 | A higher |
| Mohs hardness | 6.5–7.5 | 7.0–7.5 | Overlap |
| Birefringence | 0.039 | 0.018 | A higher |
| Dispersion | 0.039 | — | — |
| Property | A: Red Zircon (Hyacinth) | B: Rubellite |
|---|---|---|
| Crystal system | 正方晶系 | 三方晶系 |
| Pleochroism | — | 強（赤・赤紫） |
| Chelsea filter | — | red / pink |
| UV (long-wave) | — | weak (red) |
| UV (short-wave) | weak (yellow) | inert |
◆Rubellite (red tourmaline) has RI 1.62–1.64, SG 3.06, and moderate . Red zircon has much higher RI, much higher SG, and stronger — the refractometer and hydrostatic balance both give clear separations.
Distinguishing tools
Tools that decide between Red Zircon (Hyacinth) and Rubellite 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.