Abstract: A clutch for securing together component parts of jewelry such as decorative pins, clasps, earrings, necklaces, brooches, and so forth. The coacting body and pin construction herein has a lost-motion detent, whereby to provide for adjustable attachment to ear lobes, clothing, and so forth, of varying thicknesses. In a preferred embodiment of the invention, the lost-motion effect is constrained by sliding frictional engagement between complete turns of a coil spring provided in said body, and the shank of the pin and the detent effect is maintained simultaneously by a radially inturned end of the spring extending into the annular groove on the shank. The groove is wider than the inturned end, allowing for movement thereof longitudinally of the pin without disengagement.