Jewels

Precious stone used in movements as a bearing surface. Generally speaking, the steel pivots (s.) of wheels in movements turn inside synthetic jewels (mostly rubies) lubricated with a drop of oil. The jewel’s hardness reduces wear to a minimum even over long periods of time (50 to 100 years). The quality of watches is determined mainly by the shape and finishing of jewels rather than by their number (the most refined jewels have rounded holes and walls to greatly reduce the contact between pivot and stone).

Jewel:
are elements used in mechanical watches. Usually a very inexpensive form of synthetic ruby, these are used for virtually frictionless pivots or hubs at certain critical places int the watch mechanism. These jewels are worth only pennies and do not add any monetary value to a watch. It is also important to understand that more jewels does not necessarily make a better watch. While too few can certainly be a problem, the exact number needed for optimal performance depends on the specific design and features of the movement. Overall, 17 jewels is the lowest number needed for most standard mechanical watch movements. Others movements that implement different designs, or complications such a chronographs, may use more. But a novice cannot derive useful basis of evaluation or comparison from whether a watch has 17, 21, 25 or more jewels.xxxxxxxxxxxxx

Jewel:
In a movement, a synthetic ruby that serves to reduce friction on the staffs of the pivots. Jewels belong to the "other parts" category.

Jewel:
Bearing, endstone or pallet used for reducing friction. Generally made of synthetic material, except for the precious or semi-precious stones (ruby, sapphire, garnet) which are sometimes used in "de luxe" watches.

Jewelled Lever Escapement
Lever with pallet of synthetic ruby.

Jewels:
Synthetic sapphires or rubies that act as bearings for gears in a mechanical watch. The jewels reduce friction to make the watch more accurate and longer lasting. Generally made of synthetic material, except for the precious or semi-precious stones (ruby, sapphire, garnet) which are sometimes used in "de luxe" watches.

There can be a number of friction jewels in a watch.
o jewel
7 jewels
15 jewels
16 jewels
17 jewels
18 jewels
19 jewels
21 jewels
38 jewels

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