COMPARE GUIDE
Natural EmeraldVSGreen Tourmaline (Verdelite)
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
Decisive distinctionsDECISIVE
- ◎ is higher in Green Tourmaline (Verdelite), giving a numerical distinguishing point.
- ◎ is higher in Green Tourmaline (Verdelite), giving a numerical distinguishing point.
- ◎ is higher in Green Tourmaline (Verdelite), 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.
Physical propertiesPROPERTIES
| Property | A: Natural Emerald | B: Green Tourmaline (Verdelite) | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.577–1.583 | 1.624–1.644 | B higher |
| Specific gravity (SG) | 2.67–2.78 | 3.04–3.10 | B higher |
| Mohs hardness | 7.5–8.0 | 7.0–7.5 | Overlap |
| Birefringence | 0.005 | 0.018 | B higher |
| Dispersion | — | — | — |
Optics & fluorescenceOPTICS & UV
| Property | A: Natural Emerald | B: Green Tourmaline (Verdelite) |
|---|---|---|
| Crystal system | 六方晶系 | 三方晶系 |
| Pleochroism | 強（緑・青緑） | 強（緑・黄緑） |
| Chelsea filter | red / pink | green / inert |
| UV (long-wave) | weak (red) | inert |
| UV (short-wave) | inert | inert |
ObservationOBSERVATION
◆nclusions running along the c-axis, with stronger blue-green/yellow-green dichroism than emerald.
Color categoriesCATEGORIES
A: Natural Emerald
Green
B: Green Tourmaline (Verdelite)
Green
DISTINGUISHING TOOLS · 3 ITEMS
Distinguishing tools
Tools that decide between Natural Emerald and Green Tourmaline (Verdelite) 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.