What does a watch with 18 jewels mean?

A watch with 18 jewels refers to the number of synthetic rubies or sapphires used in its movement to reduce friction and wear on the moving parts. Jewels are strategically placed in areas of the movement where there is the most friction, such as the escapement and gears, to enhance the watch's accuracy and longevity. The presence of 18 jewels typically indicates a quality mechanical watch, as more jewels can signify a more complex movement. However, the number of jewels alone does not determine a watch's overall quality.