COMPARE GUIDE
Purple SapphireVSSynthetic Purple Sapphire
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
Physical propertiesPROPERTIES
| Property | A: Purple Sapphire | B: Synthetic Purple Sapphire | Verdict |
|---|---|---|---|
| Refractive index (RI) | 1.762–1.770 | 1.762–1.770 | Nearly equal |
| Specific gravity (SG) | 3.95–4.03 | 3.98–4.05 | Overlap |
| Mohs hardness | 9.0 | 9.0 | Nearly equal |
| Birefringence | 0.008 | 0.008 | Nearly equal |
| Dispersion | — | — | — |
Optics & fluorescenceOPTICS & UV
| Property | A: Purple Sapphire | B: Synthetic Purple Sapphire |
|---|---|---|
| Crystal system | 六方晶系（三方晶系） | 六方晶系（三方晶系） |
| Pleochroism | 中〜強（紫・赤紫） | 中〜強（紫・赤紫） |
| Chelsea filter | pink | — |
| UV (long-wave) | medium (red) | — |
| UV (short-wave) | weak (red) | medium (red) |
ObservationOBSERVATION
◆nclusions, and angular color banding absent in flame-fusion synthetic. Flux- and hydrothermal-grown synthetic stones show closer morphology to natural and require lab-grade FTIR/UV-Vis discrimination. and gas bubbles diagnostic of flame-fusion at 10× immersion settle the question for Verneuil material.
Color categoriesCATEGORIES
A: Purple Sapphire
Purple
B: Synthetic Purple Sapphire
Purple
DISTINGUISHING TOOLS · 3 ITEMS
Distinguishing tools
Tools that decide between Purple Sapphire and Synthetic Purple Sapphire 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.