A piece of jewelry usually designed with a post and hinge that goes through the two button holes on a shirt or (French cuffs - without buttons).

A cuff link is a device that is employed to join temporarily the two ends of a shirt cuff around the wearer's wrist. Without overlapping the cuff ends, the cuff link being inserted through two buttonholes.

Two linked buttons worn to close a shirt cuff. Coming in all shapes and sizes, from simple to extremely ornate, from knot-shaped to jewel-encrusted, cuff links have come to define sophisticated menâ€(tm)s dressing.

A decorative fastener worn to close the French cuff (a cuff without buttons) of a shirt

A cufflink (also cuff link or cuff-link) is a decorative fastener worn by men or women to fasten the two sides of the cuff on a dress shirt or blouse.