Abstract: A jewel includes a bracelet and a pendant reversibly attachable to the bracelet at an end. The pendant includes an ornamental element connected to a pin at a first end, and an elongated coupling transversally connected to the pin at a second end. An O-ring is on the pin between the coupling and the ornamental element. The bracelet is integrally connected to a block, including a cavity accommodating the coupling, and an opening crossable by the coupling by inserting it into the cavity. The O-ring is compressed between the block and the ornamental element when the coupling is inserted into the cavity. One inserts the coupling into the cavity and rotates the pendant so the coupling is arranged transversally to the opening of the block. The O-ring keeps the coupling against the portion of block delimiting the opening, preventing relative rotation between the pendant and the block.