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https://strapchange.com/what-are-watch-jewels-what-does-21-jewels-mean/
As for the referenced watch above (Seiko 5 Snk809), which has one of Seiko´s highly used and robust movements (the 7S26), there are 21 jewels inside. I assume Seiko use synthetical jewels and that they have made many attempts, in trying to create the best movement, with …
http://www.swiss-watches-guide.com/21-jewel-movement.html
A 21 jewel movement was – and still is - used to help keep the watch running smoothly. Tiny synthetic gem crystals are set between many of the gears, in order to reduce friction. These gems resist temperature better than metal, and hold lubricant much longer.
https://www.prestigetime.com/blog/what-are-the-jewels-in-a-watch-for.html
Dec 11, 2020 · Around 17 stones are used on a standard mechanical jewel watch without any high-complications, in some cases, 21 jewels are used to minimize positional errors as mentioned above.
https://www.thewatchsite.com/threads/21-jewels-meaning.10845/
Nov 30, 2016 · Jewels, in watch terms, are tiny, synthetic, non-precious stones used in watch movements as bearings. These jewel bearings wear very slowly, and reduce friction in the movement. The more jewels, the higher grade the watch is (in general). A typical good quality hand-wind or automatic watch should have about 17 jewels as a minimum.
https://www.quora.com/What-does-it-mean-when-a-watch-has-21-jewels-and-what-is-their-functionality-in-the-watch-movement
Sep 14, 2019 · Jewels are a way to act as bearings for the wheels and cogs to turn on. They're made from artificial sapphire. They're placed in those places with the highest chance of friction, and are lubricated too. Some cheap movements will make do with five ...
https://answers.yahoo.com/question/index?qid=20060829163718AAUL4eB
Aug 29, 2006 · Jewels have two important properties that help reduce friction. First, they can be made to be very smooth, and therefore they let the metal parts slide easily. Secondly, they are very hard and therefore don't wear down very quickly. The gears in a watch are carefully designed so that the teeth roll on each other, rather than sliding.
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