Abstract: The invention relates to a lever structure of clasps such as spring ring clasps or lobster claw clasps. The clasp includes a substantially annular clasp body cut at one end to have a cut-away portion, an open/close member inserted inside the clasp body such as to slide in directions to open and close the cut-away portion, and a lever integrally formed with the open/close member such as to protrude outwards from the clasp body. The lever includes a neck portion that passes through a slit of the clasp body, and a lever body with a grip surface provided to a distal end of the neck portion such as to extend in a direction orthogonal to open/close sliding directions of the open/close member. The grip surface has a width that is set longer than a cross-section diameter of the clasp body.

Abstract: A structure for adjusting the length of an ornament chain, in which the clamping area for the ornament chain is widened so as to apply a clamping force to the ornament chain without damaging the same. The structure is composed of a hollow casing formed therein with a pair of insertion or come-out openings for inserting the ornament chain, at separated positions, and a resilient member which is accommodated in the casing so as to be prevented from coming off, and which is adapted to be fitted on the ornament chain. The resilient member has a substantially cylindrical shape, defining a longitudinal slot so that end part thereof are separated from each other in order to have resiliency, and the bore being set so that an urging force is effected in a direction in which the outer periphery of the ornament chain is fastened when the ornament chains is inserted in the resilient member.