Sapphire crystal is one of the hardest substances in the world. It’s a premium synthetic material made by crystallizing pure aluminium oxide at very high temperatures.

Sapphire crystal is rated 9 out of 10 on the Mohs scale for hardness. This means it can only be scratched by itself or diamonds, making it the superior choice over mineral crystal over time.

The most expensive of all the watch crystals, sapphire crystal is highly coveted for its scratch and shatter resistance. It's ideal for watches worn on the wrist that are often knocked around and subjected to wear and tear over time. Sapphire crystal maintains its brilliance for long-lasting wear, making it the superior choice for luxury watches.

Pro tip: Sapphire crystal is highly reflective, so we recommend looking for sapphire crystal with multi-layered anti-reflective (AR) coating when shopping for your next luxury watch.

Due to it’s extreme hardness, advanced diamond-coated saws are required to polish and cut the material into circular discs with meticulous precision, making it an extremely expensive process to perfect.