Four kinds. Ordinary glass mirror, mineral crystal mirror, rubber mirror, sapphire mirror

1. Ordinary glass mirror: it is made of flat glass after polishing, the surface is smooth and shiny. Low scratch resistance and not easy to crack.

2. Ore crystal mirror surface: moderate scratch resistance, easy to break.

3. Rubber mirror: organic glue, although it is easy to be scratched, it is not easy to break.

4. Sapphire mirror: high-strength anti-scratch, high hardness of sapphire. sapphire watch glass，Watches made of sapphire have higher shock resistance, airtightness and strength than other materials.

Whether from the perspective of cultural cognition, or from the investment direction and scale of the watchmaking industry, in the foreseeable future, the sapphire mirror is still an identifier for top-level watches and a factor in the quality of top-level watches.

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