To improve continuity of oscillations by easily oscillating a jewel.

An accessory includes a dent 3 opened at least on a surface of a main body 1 of the accessory, the jewel 5 which is housed and retained in the dent 3, and a retaining member 9 attached to the main body 1 of the accessory in a manner to cover a part of the upper part of the jewel 5 to prevent the jewel 5 from dropping out of the dent 3 and retains the jewel 5 in the dent 3 to oscillate. A pavilion 5d formed in the lower half part in a pyramid shape is supported by a pair of projected rims 7 disposed in parallel to oppose with a culet 5e at the lower end part of the jewel 5 remaining afloat.