Abstract: A tool for setting a gemstone on a jewel's head has a pair of jaws which are pivotally connected to one another. The tip of each jaw comprises a substantially longitudinal ridge protruding inward along the center of the tip, and a substantially longitudinal groove or channel aligned with the main axis of the jaw. Due to the identical configuration of both jaws, when the jaws are in closed position, the corresponding ridges and grooves define a partially enclosed space substantially conforming to the shape of a conventional solitaire head with a post, thereby providing a clamping geometry that allows a firm grip on the solitaire head.

Abstract: A quick-engageable, quick-disengageable coupling or clasp for connecting the ends of a piece of jewelry such as a necklace or bracelet. The clasp includes two initially separate longitudinal bodies end-alined in use, one body having a lengthwise projecting, inner end tongue, and the other body having an inner end slot and adapted for reception, by longitudinal insertion through the slot, of the tongue; the clasp being particularly characterized by the inclusion of instrumentalities operative, without more, to secure the tonque in the other body and thus quick-engage the clasp upon the tongue being so inserted, and to release the tongue upon relative rotation of the bodies and thus quick-disengage the clasp.