What are watches crystals made of? They can be made of any of the following three materials, specifically Yacon clocks and watches for your detailed introduction.
1. Plexiglass (a transparent and lightweight plastic);
2. Ordinary glass (used to make glass windows) is usually called "mineral glass" in the watch industry.
3. Artificial sapphire (see question 4). Some crystals are made by combining minerals with sapphire glass. For example, some watches made by Seiko use crystals made from mineral glass covered with artificial sapphire. Seiko calls this synthetic material "Sapphlex"