====== Ruby ======
{{wst>image_l|Chaton|Screwed [[chaton]] at a movement of\\ [[A. Lange & Söhne]] with red **ruby**|240px}}
A **ruby**, in the case of wristwatches, is usually a synthetic ruby. It is used in watch [[movement]]s as a low-friction cover or bearing stone, in which the [[pivot]] of a wheel turns.

More see [[Jewels]].


{{tag>Terms Watch_materials}}