The Application of Sapphire Crystal in Watches
1. What is Sapphire Crystal? Sapphire crystal is a synthetic material made from aluminum oxide (Al₂O₃) under high-temperature and high-pressure conditions. Despite its name, sapphire crystal can be completely transparent and colorless. It is extremely hard, ranking 9 on the Mohs hardness scale, second only to diamonds. This makes it the preferred material for high-end […]
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