Sapphire Glass on Seiko Mod Watches: Why It's Essential in 2026
The three types of watch glass
Acrylic glass: scratches very easily, Mohs hardness 3-4. Mineral glass: standard for watches under €200, Mohs hardness 5-6. Sapphire glass: the absolute top of the range, Mohs hardness 9 — practically scratch-proof.
Practical test
To scratch a sapphire glass, you need silicon carbide, tungsten carbide, or diamond. In practice: keys, coins, concrete surfaces? None of these elements can scratch your sapphire glass.
Anti-reflective AR coating
A standard sapphire glass reflects approximately 8% of ambient light. With our AR coating treatment, this reflection drops to less than 0.5%. Result: perfect clarity under all lighting conditions.
Why all our Seiko Mods have sapphire glass
It's a matter of philosophy. Sapphire glass is the difference between a watch that stays beautiful for 10 years and a watch that is scratched after 2 years of daily use.