COMPARE GUIDE
Rock Crystal / QuartzVSColorless Zircon (High Type)
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
Decisive distinctionsDECISIVE
- ◎ is higher in Colorless Zircon (High Type), giving a numerical distinguishing point.
- ◎ is higher in Colorless Zircon (High Type), giving a numerical distinguishing point.
- ◎ is higher in Colorless Zircon (High Type), giving a numerical distinguishing point.
- ◎ is higher in Colorless Zircon (High Type), 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: Rock Crystal / Quartz | B: Colorless Zircon (High Type) | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.544–1.553 | 1.925–1.984 | B higher |
| Specific gravity (SG) | 2.64–2.66 | 4.60–4.80 | B higher |
| Mohs hardness | 7.0 | 7.5 | B higher |
| Birefringence | 0.009 | 0.039 | B higher |
| Dispersion | — | 0.039 | — |
Optics & fluorescenceOPTICS & UV
| Property | A: Rock Crystal / Quartz | B: Colorless Zircon (High Type) |
|---|---|---|
| Crystal system | 三方晶系 | 正方晶系 |
| Pleochroism | — | — |
| Chelsea filter | inert | inert |
| UV (long-wave) | inert | weak (yellow) |
| UV (short-wave) | inert | weak (yellow) |
ObservationOBSERVATION
◆Quartz (RI 1.54–1.55, SG 2.65, no acet absent.
Color categoriesCATEGORIES
A: Rock Crystal / Quartz
Colorless
B: Colorless Zircon (High Type)
Colorless
DISTINGUISHING TOOLS · 3 ITEMS
Distinguishing tools
Tools that decide between Rock Crystal / Quartz and Colorless Zircon (High Type) 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.