The Push-Pull Clasp
The Push-Pull Clasp
The push-button locking closure for necklaces and bracelets
The push-pull clasp is a closure mechanism for necklaces, bracelets, and similar pieces, in which a spring-loaded button on the body of the clasp must be pressed to release a locking pin and allow the two halves of the closure to disengage. The format provides moderate security and easy single-handed operation in the closed-to-open direction, and is widely used on fine-jewellery necklaces and bracelets where the closure is intended to be both reliable and visually unobtrusive. Push-pull clasps are produced in gold, platinum, palladium, and silver across a range of sizes and shapes, and are a routine feature of bespoke and fine-jewellery commissions.
Construction
The basic push-pull clasp consists of two interlocking components. The first is a cylindrical or rectangular body containing a spring-loaded internal locking pin that engages a corresponding socket or notch when the clasp is closed. The second is the male component — a tapered or shaped tab that slides into the body and is captured by the locking pin in the closed position. To open, the wearer presses an external button on the body, which retracts the locking pin against the spring tension; the two halves can then be pulled apart. To close, the male tab is pushed into the body until the locking pin engages, with no need for the wearer to operate the button on insertion.
The format admits considerable variation in cosmetic design. The body of the clasp can be presented as a discreet metal cylinder, as a decorative element with engraving or stone-setting on the visible face, or even as a meaningful focal element of the necklace design. The classic Cartier and Van Cleef & Arpels necklaces of the mid-twentieth century often featured push-pull clasps with significant decorative treatment, sometimes incorporating Mogok ruby, Sri Lankan sapphire, or diamond accents into the visible face of the body. Box clasps, a related family that uses a folding tongue rather than a sliding pin, are an alternative format with similar security characteristics.
Security and use
The push-pull clasp is meaningfully more secure than a spring-ring or lobster-claw clasp because the locking pin requires a deliberate button-press to release, where the spring-ring requires only a small lever to be operated. The clasp is appropriate for necklaces and bracelets carrying significant gemstones — Colombian emerald, Burmese ruby, fine diamond strands — where a more secure closure than the basic spring-ring is justified by the value at risk. The standard recommendation is to add a safety chain or a secondary catch to the most valuable pieces as a back-up against the unlikely failure of the primary clasp.
Single-handed operation in the closed-to-open direction is a practical advantage of the push-pull format. The wearer can press the button and pull the clasp apart with one hand at the back of the neck, where two-handed operation of a more complex closure can be impractical without a mirror or assistance. The reverse — closing the clasp — typically also requires only one hand, with the male tab being pushed into the body until it locks.
In the trade
For Skyjems, where necklaces and bracelets with fine gemstones are routinely commissioned for clients across the international trade, push-pull clasps are a standard component of the design vocabulary. The choice between push-pull, box, fishhook, or magnetic clasps depends on the design brief, the value at risk, and the wearer's preferences for ease of use; the push-pull is favoured for its combination of security, single-handed operation, and design flexibility. Decorative push-pull clasps with stone-set or engraved faces remain a hallmark of high-end necklace commissioning, and the format is documented in the standard jewellery-construction references and in the working archives of the major fine-jewellery houses.