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https://www.prestigetime.com/blog/what-are-the-jewels-in-a-watch-for.html
Dec 11, 2020 · A watch with 17 jewels is often called a fully jeweled watch. This means that it uses jewel (usually ruby) bearings in the mechanical movement from the balance wheel all the way to the center wheel pivot. What does 21 jewels mean in a watch? …
https://diefendorffwatches.com/blogs/news/what-are-jewels-in-a-watch
Watches have tiny pieces of synthetic ruby inside of them to help in the frictionless movement of the many tiny parts in your watch - 26 jewels simply means that there are 26 of them and 17 mean that there are 17 of them. Are the jewels in a watch valuable? Unfortunately, they are not valuable.
http://www.rdrop.com/~jsexton/watches/museum/kyp/jewels.html
Jewel bearings for watches are mostly made of six materials:garnet, natural sapphire, natural ruby, scientific sapphire and scientific ruby and sometimes diamond. Garnet is not the equal of the latter five stones because it is considerably softer and more likely to wear and become chipped. Between the natural ruby and sapphire and the scientific jewels there is very little difference and it is with these four …
https://watchranker.com/why-watches-have-jewels/
Jun 20, 2018 · Sapphire is a common jewel used inside watches. Precious stones like diamond, sapphire, ruby, and garnet were used in the moving parts of watches ever since the invention of jewel bearings in 1704.
https://strapchange.com/what-are-watch-jewels-what-does-21-jewels-mean/
Meaning all the rotating parts and other high frictional points in the watch; which before were metal againts metal parts, were exchanged with hard jewels. Back in the days it was natural jewels (diamonds, sapphire and rubies) which were grinded and put into the watches.
https://quillandpad.com/2018/06/29/the-number-of-jewels-in-a-watch-movement-indicates-value-doesnt-it-a-myth-debunked/
Jun 29, 2018 · The Number Of Jewels In A Watch Movement Indicates Value, Doesn’t It? A Myth Debunked. “Boules”. The jewels that we use in watches today and decades past are synthetic, the most common being synthetic ruby. These jewels are grown in a …
https://en.wikipedia.org/wiki/Mechanical_watch
Jewels in modern watches are all synthetic sapphire or (usually) ruby, made of corundum(Al2O3), one of the hardest substances known. The only difference between sapphire and ruby is that different impurities have been added to change the color; there is no difference in their properties as a bearing.
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