Someone who wears a watch sometimes doesn’t understand the material of the watch mirror. Some knowledgeable friends can easily see the material of the watch mirror. Some people who don’t understand will definitely say that they want to judge whether their watch is a sapphire mirror. What method should you use? When I hear the gem series, I will definitely think it is high-end. In fact, it is a high-standard artificial composite. Generally, it is colorless and transparent without ...
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