What is mop dial on watches?

A mop dial, or mother-of-pearl dial, refers to a watch face made from the iridescent inner layer of certain mollusk shells. This material is prized for its unique, shimmering appearance, which can vary in color and pattern, giving each dial a distinct look. Mop dials are often used in luxury watches to enhance their beauty and elegance. The use of this material can also signify craftsmanship and exclusivity in watchmaking.