Jewels in watchmaking refer to small, synthetic gemstones, typically made of ruby or sapphire, used as bearings in a watch movement. These jewels are crucial components in the construction of a watch, serving to reduce friction between the moving parts, such as the gears and pivots, thereby enhancing the accuracy and longevity of the timepiece. The hardness and smoothness of these gemstones make them ideal for minimizing wear and tear, ensuring that the watch operates smoothly over time.

In a mechanical watch, jewels are strategically placed at points where there is significant movement and potential for friction. Commonly, they are found in the escapement mechanism, which is responsible for regulating the release of energy from the mainspring to the gear train. The number of jewels in a watch can vary, with basic movements having as few as 17 jewels, while more complex movements, such as those with additional complications, may contain 20 or more.

The use of jewels in watchmaking dates back to the 18th century and remains a hallmark of quality in modern horology. While the presence of jewels is not a direct indicator of a watch's quality, it often signifies a well-crafted movement designed for precision and durability.