A watch bezel encompasses the dial of a pocket or wrist watch and holds the crystal, the glass or acrylic covering in place. Bezels can be decorative or rotate to perform various functions.
The bezel screws into the watch case, which contains the movement that makes the timepiece run. The crystal is secured under the bezel.
A bezel can be made of a variety of materials. It could be gold filled, 18-karat gold, gold-plated, brass, plastic, titanium or stainless steel.
The bezel can be decorative, encrusted with diamonds or gems, or it may be embossed with the watchmaker’s logo. It could feature numbers and markers instead of being placed directly on the dial.
Some watch bezels rotate, which allows a scuba diver, for example, to move the ring to read water pressure or distance markings.
A bi-directional bezel rotates counterclockwise or clockwise to perform mathematical functions, much like a slide rule, to measure speed.
A uni-directional bezel moves only counterclockwise on dive watches to prevent divers from accidentally changing air-supply estimations.