Basic Characteristics of Lab-Grown Emerald:
- **Composition**: Same as natural emerald (Be₃Al₂Si₆O₁₈, chromium/vanadium coloration).
- **Hardness**: 7.5-8 (Mohs), brittle and resistant to knocks.
- **Refractive index/gloss**: 1.577-1.583, glassy.
- **Inclusions**: Laboratories can simulate natural inclusions (e.g., “three-phase inclusions”), but are usually purer.