The watch is protected by Corning Gorilla Glass 3. Scratches would occur if the watch came into contact with sand, for example. There are also protective glasses, e.g. this one.
Dipos Screen Protector Anti-ShockThere are Xiaomi S1 models that are protected by a synthetic sapphire glass, maybe that would also be an alternative? The S1 can also make Bluetooth phone calls and GPS tracking is also possible for a long time. The S1 is charged wirelessly with the included charger or a normal QI charger.
Xiaomi Watch S1 (46.50 mm, steel)The S1 Pro is a slightly newer yet slightly more sophisticated model, which would also have a digital crown:
Xiaomi Watch S1 Pro (46 mm, stainless steel)