COMPARE GUIDE
AquamarineVSBlue Fluorite
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
- ◎ is higher in Aquamarine, giving a numerical distinguishing point.
- ◎ is higher in Blue Fluorite, giving a numerical distinguishing point.
- ◎ is higher in Aquamarine, 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.
| Property | A: Aquamarine | B: Blue Fluorite | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.567–1.583 | 1.433–1.435 | A higher |
| Specific gravity (SG) | 2.66–2.80 | 3.00–3.25 | B higher |
| Mohs hardness | 7.5–8.0 | 4.0 | A higher |
| Birefringence | 0.006 | — | — |
| Dispersion | — | 0.007 | — |
| Property | A: Aquamarine | B: Blue Fluorite |
|---|---|---|
| Crystal system | 六方晶系 | 等軸晶系 |
| Pleochroism | 強（青・無色） | — |
| Chelsea filter | inert | — |
| UV (long-wave) | inert | — |
| UV (short-wave) | inert | strong (blue) |
◆Aquamarine (Be₃Al₂Si₆O₁₈ beryl, Mohs 7.5, SG 2.68–2.74, RI 1.567–1.583, doubly refractive uniaxial negative, hexagonal , no ) versus blue fluorite (Mohs 4, SG 3.18, RI 1.434, singly refractive isotropic cubic, strong blue-violet LW-UV , perfect octahedral ). The hardness gap (Mohs 7.5 versus 4) and the refractive-index gap (1.567–1.583 versus 1.434) are decisive — fluorite is unambiguously separated by refractometer and scratch test. The alone is diagnostic: aquamarine is inert while fluorite shows the characteristic strong blue-violet response under 365 nm UV that gave its name.
Distinguishing tools
Tools that decide between Aquamarine and Blue Fluorite 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.