Why choose the sapphire glass?

Sapphire Windows are manufactured from single crystal sapphire, making them ideal for demanding applications (such as laser systems) because of their extreme surface hardness, high thermal conductivity, high dielectric constant and resistance to common chemical acids and alkalis. Sapphire is the second hardest crystal next to diamonds and, because of their structural strength, sapphire windows can be made much thinner than other common dielectric windows with improved transmittance. Chemically, sapphire is single crystal aluminum oxide (Al2O3), and is useful in a transmission range from 0.2 - 5.5µm.

As the window to your timepiece, the watch crystal takes some of the hardest hits, and the brunt of the everyday wear and tear. To extend the life of your watch crystal, crystals are made of different materials to ensure different kinds of strength.