COMPARE GUIDE
Orange Sapphire / PadparadschaVSSpessartite Garnet
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
- ◎ is higher in Spessartite Garnet, giving a numerical distinguishing point.
- ◎ is higher in Spessartite Garnet, giving a numerical distinguishing point.
- ◎ is higher in Orange Sapphire / Padparadscha, 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: Orange Sapphire / Padparadscha | B: Spessartite Garnet | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.762–1.770 | 1.795–1.815 | B higher |
| Specific gravity (SG) | 3.95–4.03 | 4.12–4.20 | B higher |
| Mohs hardness | 9.0 | 7.0–7.5 | A higher |
| Birefringence | 0.008 | — | — |
| Dispersion | — | — | — |
| Property | A: Orange Sapphire / Padparadscha | B: Spessartite Garnet |
|---|---|---|
| Crystal system | 六方晶系（三方晶系） | 等軸晶系 |
| Pleochroism | 中（オレンジ・黄オレンジ） | — |
| Chelsea filter | — | inert |
| UV (long-wave) | — | inert |
| UV (short-wave) | weak (orange) | inert |
◆Spessartite is singly refractive (garnet), shows no at the loupe, and has weaker ; orange sapphire is doubly refractive, shows strong , and is denser (SG 4.0 vs 4.15 — close, but the refractometer settles it definitively).
Distinguishing tools
Tools that decide between Orange Sapphire / Padparadscha and Spessartite Garnet 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.