How Does Sapphire Crystal Affect the Durability of Waterproof Luxury Watches? A dive watch can face scratches from equipment, accidental knocks against hard surfaces, and pressure changes during underwater use. Its crystal must protect the dial without compromising visibility or structural reliability. This is where sapphire becomes important. Many waterproof luxury watches use synthetic sapphire because of its exceptional surface hardness and resistance to everyday scratches. visit our website. https://www.americasmallbiz.com/articles/how-does-sapphire-crystal-affect-the-durability-of-waterproof-luxury-watches