There are a few ways to identify whether a watch has a sapphire glass or not:

1. Look for the term "sapphire" in the watch's specifications or description. Many watch brands will explicitly state that their watch features a sapphire crystal.

2. Check the reflection of the glass. Sapphire crystal is highly scratch-resistant, so it will reflect light differently than regular mineral glass or plastic. Hold the watch at an angle and see if the reflection of the glass looks like a prism, with rainbow colors visible. If so, it's likely sapphire.

3. Use a diamond tester. Sapphire is one of the hardest materials on earth, and a diamond tester can help you identify if a watch has a sapphire crystal by measuring its hardness.

4. Look for the "Swiss Made" mark. Watches that are made in Switzerland and have a sapphire crystal will often display the "Swiss Made" mark on the dial or case back. This mark guarantees the use of high-quality materials in the watch's construction, including sapphire crystal.

5. Take the watch to a jeweler or watchmaker. A professional can quickly identify the type of crystal used in the watch and advise you accordingly.

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