What is a Sapphire Crystal?

– Sapphire crystal has become the industry standard among Swiss watchmakers. Even though there are naturally occurring clear sapphires, the sapphire used for the industry is synthetic. Sapphire is a Corundum, and as such carries a ranking of 9 on the MoH’s Scale of hardness. This means that the crystal can only be scratched by another sapphire or a diamond, which is the hardest naturally occurring mineral in the world.