Ornament having an annular structure

An ornament, particularly having an annular structure, comprising at least two jaws, which rotate on a plane that is substantially perpendicular to the fitting axis and support, substantially at their respective free end portions, closure elements that comprise a portion that supports at least one engagement tooth and is supported by a first one of the two free ends and at least one abutment seat for the engagement tooth that is supported by the other one of the two free ends; the closure elements comprise a release button that is kinematically connected to the at least one engagement tooth or to the at least one seat and disengages, under the actuation of the user, the at least one engagement tooth from the at least one closure seat.