COMPARE GUIDE
Grossular GarnetVSPeridot
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
Decisive distinctionsDECISIVE
- ◎ is higher in Grossular Garnet, giving a numerical distinguishing point.
- ◎ is higher in Grossular Garnet, 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: Grossular Garnet | B: Peridot | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.734–1.759 | 1.654–1.690 | A higher |
| Specific gravity (SG) | 3.57–3.73 | 3.27–3.48 | A higher |
| Mohs hardness | 6.5–7.5 | 6.5–7.0 | Overlap |
| Birefringence | — | 0.036 | — |
| Dispersion | — | — | — |
Optics & fluorescenceOPTICS & UV
| Property | A: Grossular Garnet | B: Peridot |
|---|---|---|
| Crystal system | 等軸晶系 | 斜方晶系 |
| Pleochroism | — | 弱〜中（緑・黄緑） |
| Chelsea filter | — | green / inert |
| UV (long-wave) | — | inert |
| UV (short-wave) | inert | inert |
ObservationOBSERVATION
◆Peridot shows strong at 10× ( ~0.036) and yellow-green with no purple modifier; grossular is singly refractive with no .
Color categoriesCATEGORIES
A: Grossular Garnet
Green / Yellow / orange
B: Peridot
Green
DISTINGUISHING TOOLS · 3 ITEMS
Distinguishing tools
Tools that decide between Grossular Garnet and Peridot 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.