COMPARE GUIDE
Natural AmethystVSKunzite
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
Decisive distinctionsDECISIVE
- ◎ is higher in Kunzite, giving a numerical distinguishing point.
- ◎ is higher in Kunzite, giving a numerical distinguishing point.
- ◎ is higher in Kunzite, 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 Amethyst | B: Kunzite | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.544–1.553 | 1.660–1.681 | B higher |
| Specific gravity (SG) | 2.64–2.66 | 3.10–3.20 | B higher |
| Mohs hardness | 7.0 | 6.5–7.0 | Overlap |
| Birefringence | 0.009 | 0.014 | B higher |
| Dispersion | — | — | — |
Optics & fluorescenceOPTICS & UV
| Property | A: Natural Amethyst | B: Kunzite |
|---|---|---|
| Crystal system | 三方晶系 | 単斜晶系 |
| Pleochroism | 弱（紫・赤紫） | 強（ピンク・無色・紫ピンク） |
| Chelsea filter | inert | pink |
| UV (long-wave) | inert | strong (orange / red) |
| UV (short-wave) | inert | weak (orange) |
ObservationOBSERVATION
◆Amethyst is inert under both long-wave and short-wave UV, whereas kunzite reacts with a strong orange to pink long-wave — a single UV lamp settles the call.
Color categoriesCATEGORIES
A: Natural Amethyst
Purple
B: Kunzite
Purple
DISTINGUISHING TOOLS · 3 ITEMS
Distinguishing tools
Tools that decide between Natural Amethyst and Kunzite 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.