COMPARE GUIDE
Demantoid GarnetVSNatural Emerald
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
Decisive distinctionsDECISIVE
- ◎ is higher in Demantoid Garnet, giving a numerical distinguishing point.
- ◎ is higher in Demantoid Garnet, giving a numerical distinguishing point.
- ◎ is higher in Natural Emerald, 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: Demantoid Garnet | B: Natural Emerald | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.880–1.895 | 1.577–1.583 | A higher |
| Specific gravity (SG) | 3.82–3.85 | 2.67–2.78 | A higher |
| Mohs hardness | 6.5–7.0 | 7.5–8.0 | B higher |
| Birefringence | — | 0.005 | — |
| Dispersion | 0.057 | — | — |
Optics & fluorescenceOPTICS & UV
| Property | A: Demantoid Garnet | B: Natural Emerald |
|---|---|---|
| Crystal system | 等軸晶系 | 六方晶系 |
| Pleochroism | — | 強（緑・青緑） |
| Chelsea filter | red / pink | red / pink |
| UV (long-wave) | inert | weak (red) |
| UV (short-wave) | inert | inert |
ObservationOBSERVATION
◆Emerald is doubly refractive and shows much less fire. RI is also far lower (~1.58).
Color categoriesCATEGORIES
A: Demantoid Garnet
Green
B: Natural Emerald
Green
DISTINGUISHING TOOLS · 3 ITEMS
Distinguishing tools
Tools that decide between Demantoid Garnet and Natural Emerald 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.