Abstract: A sliding hook for clasping pearl or similar jewelry necklaces that have both a free and a fixed end including a body having a rear side, a ring of a substantially open turn shape disposed on the body so as to allow for slightly oblique passing of the free end of the necklace, a joining point disposed on the rear side of the body for affixing the fixed end of the necklace, and an articulated annular blade having legs with tension and disposed on the rear side of the body so that the tension of the legs applied against the ring retains the pearl that is disposed between the ring and the annular blade and thus determines the length of the hanging free end of the necklace being passed through the ring.

Abstract: A clasping device for necklaces, bracelets and the like and including two juxtaposed parts, having back faces, and hooking and articulation components attached to the backfaces of the parts and further including a continuous first ring solidly attached to one of the parts and having an arc extending to an articulation point disposed on the other of the parts, the arc forming a second ring when the clasping device is clasped which occurs when the two parts become flush and at the same level with each other.