COMPARE GUIDE
Synthetic EmeraldVSSynthetic Green Sapphire
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
- ◎ is higher in Synthetic Green Sapphire, giving a numerical distinguishing point.
- ◎ is higher in Synthetic Green Sapphire, giving a numerical distinguishing point.
- ◎ is higher in Synthetic Green Sapphire, giving a numerical distinguishing point.
- ◎ is higher in Synthetic Green Sapphire, 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: Synthetic Emerald | B: Synthetic Green Sapphire | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.560–1.580 | 1.762–1.770 | B higher |
| Specific gravity (SG) | 2.65–2.71 | 3.98–4.05 | B higher |
| Mohs hardness | 7.5–8.0 | 9.0 | B higher |
| Birefringence | 0.005 | 0.008 | B higher |
| Dispersion | — | — | — |
| Property | A: Synthetic Emerald | B: Synthetic Green Sapphire |
|---|---|---|
| Crystal system | 六方晶系 | 六方晶系（三方晶系） |
| Pleochroism | 強（緑・青緑） | 強（緑・黄緑） |
| Chelsea filter | red | — |
| UV (long-wave) | strong (red) | — |
| UV (short-wave) | weak (red) | inert |
◆Synthetic emerald is Be₃Al₂(SiO₃)₆ : Cr (beryl, hexagonal) with RI 1.560–1.580, SG 2.65–2.78, Mohs 7.5, and strong red UV — a completely different species. Synthetic green sapphire is Al₂O₃ (corundum, trigonal) with RI 1.760–1.770, SG 3.95–4.03, Mohs 9, and inert UV response. Mohs and refractometer readings immediately settle the species question.
Distinguishing tools
Tools that decide between Synthetic Emerald and Synthetic Green Sapphire 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.