Jewels in movements?

"25-jewel movement" implies that the movement incorporates 25 jewels.

Jewels (rubies, sapphires, garnets and diamonds, to be exact) are used in movements that animate higher grade watches. The jewels are applied in a movement for their functional value – for friction reduction as they can be made smoother and they are remarkably hard. Jewels are used as the bearings for the wheel trains and in high-wear parts, including the escape lever and impulse jewel.

It should be noted that automatic winding movements, and complicated movements, for example movements that provide the chronograph function or the calendar function, have more jewels.

A watch with a high number of jewels will not wear out quickly.