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Red Zircon (Hyacinth)VSNatural Ruby
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 Natural Ruby, 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: Natural Ruby | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.925–1.984 | 1.762–1.770 | A higher |
| Specific gravity (SG) | 4.60–4.80 | 3.97–4.05 | A higher |
| Mohs hardness | 6.5–7.5 | 9.0 | B higher |
| Birefringence | 0.039 | 0.008 | A higher |
| Dispersion | 0.039 | — | — |
| Property | A: Red Zircon (Hyacinth) | B: Natural Ruby |
|---|---|---|
| Crystal system | 正方晶系 | 六方晶系（三方晶系） |
| Pleochroism | — | 強（紫赤・黄赤） |
| Chelsea filter | — | red |
| UV (long-wave) | — | strong (red) |
| UV (short-wave) | weak (yellow) | weak (red) |
◆Ruby has RI 1.76–1.77, SG 4.0, and shows no at 10×. Red zircon has RI 1.92–2.01 (off-the-scale on the refractometer), SG 4.6–4.7, and pronounced . The two are easily separated under loupe and refractometer.
Distinguishing tools
Tools that decide between Red Zircon (Hyacinth) and Natural Ruby 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.