If you have looked at older mechanical watches, you have probably seen 17 Jewels, 21 Jewels or another jewel count printed on the dial or movement. It sounds luxurious, but in watchmaking the number has a practical meaning rather than simply describing decoration.
What are jewels in a watch movement?
Mechanical movements contain many small moving parts. Watchmakers use very hard synthetic jewel bearings at selected friction points in the movement. These bearings help moving components operate with less wear. The jewel count therefore describes part of the movement’s construction; it is not a count of decorative gemstones on the watch.
Modern movements can use different numbers of jewels depending on their design and functions. For example, Seiko publishes mechanical calibres with different jewel counts, so the number alone should not be treated as a simple quality score.
What does “17 jewels” mean?
On a watch marked 17 jewels, the movement is described as using 17 jewel bearings. This is a common marking on many traditional mechanical watches. It can tell you something factual about the movement, but it does not by itself tell you the watch’s age, accuracy, condition, rarity or value.
Does a higher jewel count mean a better watch?
Not necessarily. Movement architecture matters. Additional complications and different designs can require additional jeweled bearing points, while another well-designed movement may use fewer. A jewel count is best treated as a technical specification rather than a ranking.
When buying a pre-owned mechanical watch, condition and actual operation are more useful than comparing jewel numbers alone. Mechanical accuracy can also vary with factors such as winding state, temperature, position and use.
What should you check on a pre-owned 17-jewel watch?
Look beyond the number on the dial. Check whether the seller states if the movement has been tested, whether winding and setting functions operate, what cosmetic wear is visible, and whether any service history is actually documented. Photographs of the real watch should also be reviewed carefully.
A jewel marking should never be used on its own to infer a production year, manufacturer, service history or movement condition.
Examples currently at Sekund
Sekund currently has several watches where jewel information is explicitly documented. The Rutina 17 Jewels Incabloc Mechanical Watch is listed as a Swiss manual-wind mechanical watch with 17 jewels and Incabloc shock protection. The G-Line Swiss 17 Jewels Incabloc Red Dial Watch is another 17-jewel manual-wind example. For a different jewel count, the Nelson Supermaster Mechanical Watch is documented with 23 jewels.
These examples also show why jewel count should be read alongside the rest of the listing: movement type, condition and tested operation can differ from watch to watch.
Browse Sekund’s current watch selection for more pre-owned mechanical, quartz and Swiss watches.