Glossary
Sapphire crystal on watches
sapphire crystal watch
Sapphire crystal is lab-made corundum used as a watch's “glass.” It's far more scratch-resistant than mineral glass, though it can still shatter under a sharp hit and costs more to replace than acrylic.
Practical trade-offs
Daily desk and travel life favor sapphire, since keys and sand rarely mark it. Acrylic (sometimes called hesalite) scratches easily but can be polished, and it tends to crack rather than shatter. Mineral glass sits in between. Most modern watches use sapphire on the front, and some on exhibition casebacks too.
What it doesn't mean
Sapphire isn't unbreakable, and it isn't proof of authenticity on its own. Anti-reflective coatings change glare and how smudges show. On a daily watch, sapphire is a good sign of quality, but it's one spec among many.
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