1. Sapphire is a very hard material, second only to diamond in hardness. This enables the sapphire case to resist scratches and wear during daily use, maintaining the integrity of the watch's appearanceGood without damage, extending the lifespan of the watch.

2. Sapphire has extremely high optical transparency and can effectively transmit light. This means that the sapphire case can clearly display the time, date, and other functions on the dial, ensuring that users can easily read information under different lighting conditions.

3. The chemical stability of sapphire enables it to resist the erosion of a variety of chemical substances, including sweat, perfume and detergent. This makes the sapphire case more durable for daily wear, reducing damage caused by chemicals.

4. Sapphire watch cases usually have a smooth surface and a sensitive appearance, which can enhance the overall beauty of the watch. Many high-end watch brands choose sapphire as the case material to enhance the grade and attractiveness of their products.

5. Although sapphire itself does not directly provide waterproof function, its sturdy characteristics help enhance the overall sealing of the watch. Combined with other waterproof designs, it can effectively prevent moisture from entering the movement.

6. Sapphire can maintain its physical and chemical properties in both high and low temperature environments, allowing it to maintain good performance under various climatic conditions.

7. In some watches with complex functions, the sapphire case can effectively protect the internal complex mechanical structure and electronic components, ensuring their normal operation.
   

In short,Gemstone Crystal Smart Watch Case Cover GlassDue to its excellent performance and beautiful appearance, it has become an important material widely used in high-end watches and is favored by watch manufacturers and consumers.