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JYOPTO selects premium domestic and imported sapphire crystals to produce mid/high-end watch sapphire crystals, laser/IR sapphire windows, pressure-sensor sapphire windows and precision instrument sapphire components — in single-bridge, double-bridge, domed, flat, grooved, open-slot, phone covers, MP3/MP4 covers, three-piece bonded chips, calendar chips, irregular watch glasses and more. Sapphire glass is synthetic corundum with hardness 9 (like ruby), used for watch faces and other wear-resistant applications; various chemical dopants can generate different colors.