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Jewels in Watch Movemeents

Jewels are man-made artificial rubies or sapphires that have been drilled, champfered, and polished to serve as bearings for the gears and as stones for the pallet-arms. This reduces the friction of mechanical parts against each other to a minimum. Most Swiss watches today will have 19 or more Jewels. A quality mechanical piece needs at least 15.

The popular ETA 2824 has 25 jewels. It's more presigious sibling, the ETA 2892 only uses 21 jewels.

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