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Horology J

When referring to movements, jewels are the bearings used to reduce friction.

Synthetic rubies are used because of their hardness, which reduces friction and wear.

A great amount of jewels does not necessarily mean a watch has high quality; only a certain number of jewels are needed to allow a watch to perform optimally.

Joint Joints are used in water-resistant watches in order to make the case entirely hermetic. The functions are similar to O-ring.
Jump Hour A watch in which the hour is indicated by a number springing into view, rather than by a hand; also referred to by the French term heures sauhntes. Less commonly, a traditional hour hand that jumps in one - hour increments precisely at the change of the hour.

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