Abstract: A clasp (1) for bracelets, necklaces and similar items has a female element and a male element fastened together by a plug belonging to the male element that fastens in a corresponding hole in the female element by a locking belong to an extending member. The extending member has a protruding actuator end and a first part held in a first seat of the plug, which has a fork at its end created by two arms spread apart that meet to create a seat that encloses across a fixed pin set crossways through the first seat of the plug. The plug has an opening to introduce a tool suited to closing the arms rotating around the fixed pin.

Abstract: The invention is a clasp for jewellery items comprising a female element suitable for housing a protruding element belonging to a male element. Said protruding element is provided with a pair of coupling elements, each one positioned at one end of a pair of shaped rods cooperating with operating means suitable for achieving the caliper-like movement of said rods around a pin that connects them to each other and to the body of said male element in order to obtain the connection or the disconnection of said coupling elements to or from corresponding check elements belonging to said female element.

Abstract: The invention is a lock for pieces of jewellery and bijouterie and consists of a first element (2; 300) connected with one end of one of said articles and of a second element (3; 400) connected with the other end of the same article, elements which are joined together by means of coupling devices. Said coupling devices consist of a male element (35; 335) that belongs to said second element and couples in a corresponding seat (23; 323) belonging to said first element by means of elastic elements (5; 500) that in turn allow said elements to join together by means of a snap, but prevent them from separating after coupling.