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Armin Strom Dual Time Resonance Sapphire Case

Although sapphire crystal is widely used in the watch industry, it is usually produced in the form of a flat or slightly curved disc. This hard material poses many challenges when used to form complex, larger shapes.


Sapphire crystal has a hardness of 9.0 on the Mohs scale. Diamond is the hardest mineral, with a hardness of 10.0. Diamond-coated tools are used to cut and mill watch case components from large blocks of sapphire crystal or corundum. Thereafter, the case components are allowed to relax, allowing the heat generated by the processing to dissipate evenly through the crystal. The crystal is then polished from opaque to transparent.


Due to its hardness, watch cases can chip, crack, or break easily, so the manufacturing process cannot be rushed. However, the look of the sapphire crystal and the views it offers justifies the watch brand’s long-term efforts. replica Richard Mille RM 011 Felipe Massa