Glossary

They are synthetic sapphires or gemstones, which are used as bearings to hold the watch's drive parts to reduce friction and wear of these parts, allowing for the smooth and accurate operation of the watch.

  These gems are carefully placed at strategic points within the movement of the watch, and sapphire or synthetic gems are preferred for this purpose as they have excellent hardness and durability, which helps reduce friction and prevent increased wear over time. Gem bearings provide a smooth surface for the rotating or pivoting parts of a watch, allowing them to move with minimal resistance.