Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide (Al2O3) with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium. Followings are features of Sapphire:
- Scratch resistance
- Abrasion resistance
- High mechanical strength
- High temperature resistance
- Good thermal stability
- High optical production rate
