A "MOP dial watch" refers to a timepiece featuring a dial made from Mother of Pearl (MOP), the iridescent inner layer of mollusk shells, particularly those from the Pinctada family of pearl oysters. This natural material is prized for its shimmering, multicolored appearance, which gives each watch a unique and luxurious aesthetic.

Mother of Pearl,is a delicate and brittle material that requires skilled craftsmanship to shape and incorporate into watch dials. The process involves sourcing suitable shells, pounding them into thin sheets (approximately 0.2mm to 0.5mm thick), cutting them into the desired dial shapes, and then finishing them with engraving, patterning, painting, varnishing, or lacquering. This meticulous process can take between four to six weeks to complete.