COMPARE GUIDE
Natural White SapphireVSSynthetic White Sapphire (Colorless Synthetic Corundum)
Side-by-side comparison of physical properties, fluorescence, and crystal system — to identify by observation.
| Property | A: Natural White Sapphire | B: Synthetic White Sapphire (Colorless Synthetic Corundum) | 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 | — | — | — |
| Property | A: Natural White Sapphire | B: Synthetic White Sapphire (Colorless Synthetic Corundum) |
|---|---|---|
| Crystal system | 六方晶系（三方晶系） | 六方晶系（三方晶系） |
| Pleochroism | — | — |
| Chelsea filter | inert | inert |
| UV (long-wave) | inert | inert |
| UV (short-wave) | weak (white) | medium (white) |
◆nclusions, and occasionally faint pinkish or yellowish color hint. Synthetic shows curved growth striae diagnostic of flame-fusion at 10× immersion; Czochralski-pulled material shows interface striae instead. RI 1.760–1.770, SG ~4.00, Mohs 9, and 0.018 are identical between natural and synthetic colorless corundum, making morphology and FTIR/UV-Vis spectra the lab-grade discriminators.
Distinguishing tools
Tools that decide between Natural White Sapphire and Synthetic White Sapphire (Colorless Synthetic Corundum) 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.