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https://www.prestigetime.com/blog/what-are-the-jewels-in-a-watch-for.html
Dec 11, 2020 · Watches are no different and also use bearings and these bearings that are found in the higher-end automatic and hand-wound watches are made out of jewels. These precious stones are smooth and don't allow much friction and are therefore …
https://www.watch-wiki.net/index.php?title=Jewels
A jewel is a component of a watch movement . Jewels are synthetically produced rubies, which are used to reduce friction in the main bearings of the moving parts of a watch movement . Quartz watches with few moving parts have only a few jewels, mechanical watches have 17 to about 50 jewels depending on the complexity of the movement.
https://en.wikipedia.org/wiki/Automatic_watch
The next development for automatic watches came in 1948 from Eterna Watch. To wind a watch effectively, one of the chief requirements of a rotor is heft. Until this point, the best bearing used in any watch was a jewel bearing, which perfectly suits the small gears of a watch. A rotor, on the other hand, requires a different solution.
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