A chatonChaton A chaton is a small, circular metal ring that is used in mechanical watch movements to hold and position a jewel bearing within the bridges. It is typically made of precious metal and is essentially purely decorative in nature. [Learn More] is a small, circular metal ring that is used in mechanical watch movements to hold and position a jewelJewels Watch jewels are small, synthetic sapphire or ruby bearings that are used in mechanical watches to reduce friction and wear on moving parts. They are typically made from corundum. They are used as bearings for a.o. the pivots to reduce friction. [Learn More] bearing within the bridgesBridges The bridges of a watch movement are the metal plates that hold the wheels and other components of the movement in place. They are attached to the main plate of the movement with screws. Bridges are used to support the balance wheel, the escapement, the mainspring barrel and other elements. Combined with the main plate they are the foundation of any watch movement. [Learn More]. It is typically made of precious metal and is essentially purely decorative in nature.