Endstone is a watch term used to refer to the jewels that are placed in the watch mechanism to reduce friction and wear. They are typically made of hardened synthetic rubies, sapphires, or other gemstones, and are placed in the bearings and pivots of the watch movement. Endstone jewels are usually held in place with a gold or steel setting and are designed to absorb shock and reduce wear and tear on the watch components. Endstone jewels are often used in luxury watches as they are a symbol of quality and precision.
