Cold riveting is a mechanical fastening method in which a short length of wire or tube — the rivet — is passed through aligned holes drilled in two or more layers of material, and the protruding ends are then deformed by hammering at room temperature to form retaining heads that clamp the layers permanently together. Because no heat source is involved, the technique is indispensable wherever soldering would anneal, discolour, or structurally compromise the surrounding metal, or where adjacent materials — leather, wood, shell, resin, enamel, or set gemstones — would be damaged by flame or flux. Cold riveting is one of the oldest metalworking joints in existence and remains, in its essentials, unchanged from ancient practice, even as contemporary jewellers employ it with considerable design sophistication.

Principles of the Joint

The mechanical logic of a cold rivet is straightforward: the rivet shank fills the drilled hole, preventing lateral movement, while the two formed heads — one pre-existing (the factory head or set head) and one created by the jeweller during assembly (the shop head or closing head) — bear against the outer faces of the assembly and resist axial separation. The clamping force is a function of the degree to which the closing head has been spread and work-hardened against the surface. A well-executed rivet achieves a degree of work-hardening through the peening process itself, which increases the hardness and tensile strength of the deformed metal and contributes to joint integrity.

The diameter of the drilled hole is critical: too loose and the shank will buckle rather than fill the hole cleanly; too tight and insertion becomes impractical and the surrounding material risks cracking. Standard practice calls for a hole diameter that matches the wire gauge as closely as possible, typically leaving no more than a few hundredths of a millimetre of clearance. The length of wire extending beyond each face — the rivet allowance — determines the volume of metal available to form the head; for a domed head, a protrusion of approximately one to one-and-a-half times the wire diameter is conventional.

Materials and Wire Selection

Fine silver and fine gold are the preferred rivet materials in fine jewellery because their high malleability allows heads to be formed with minimal hammering force and without cracking. Sterling silver is serviceable but work-hardens more rapidly, requiring care to avoid splitting the forming head. Copper and brass rivets are common in base-metal and mixed-media work. Argentium silver, with its slightly different work-hardening curve, behaves comparably to fine silver for most riveting applications.

Tube rivets — short sections of drawn tubing rather than solid wire — offer a variant with distinct advantages: the hollow shank is easier to flare outward, the finished rivet is lighter, and the tube bore can serve a secondary function, such as accommodating a cord, a decorative inlay, or a pivot pin in a hinged or articulated piece. Tube rivets are particularly associated with the attachment of findings and the construction of articulated links in contemporary studio jewellery.

Tools and Process

The essential tools are a drill or flex-shaft with an appropriate bit, a steel bench block or anvil, a ball-peen hammer or riveting hammer, and optionally a centre punch for locating holes accurately. A riveting hammer — characteristically lightweight, with a slightly convex face — allows controlled, incremental peening without bruising the surrounding metal surface. Many jewellers use a dedicated rivet set, a steel punch with a domed or cupped recess that shapes the closing head uniformly and protects the work surface.

The sequence of operations is as follows:

• Drill aligned holes through all layers to be joined, using a bit matched to the rivet wire gauge.
• Deburr the holes on both faces to ensure flush seating and to prevent the rivet head from riding on a burr.
• Cut the rivet wire to length, allowing the correct protrusion on each side, or insert a pre-headed commercial rivet from one face.
• Support the pre-existing head firmly on the bench block or in a rivet set.
• Using light, centred hammer blows, begin spreading the exposed end of the wire outward from the centre, working in a circular pattern to develop an even, domed head.
• Continue peening until the head is fully formed and seated flush or proud of the surface as design requires.
• If a flush rivet is desired, file the head level and finish to match the surrounding surface.

The process demands patience: heavy blows risk buckling the shank within the hole or cracking a brittle closing head. Annealing the rivet wire before use — a brief step that does not affect the assembled piece — can improve malleability where fine or sterling silver is used.

Design Considerations and Aesthetic Roles

In contemporary studio jewellery, cold rivets are frequently left visible as deliberate design elements rather than concealed. A row of domed fine-silver rivets along the edge of a fabricated cuff, or a single bold rivet securing a forged element to a sheet ground, reads as an honest declaration of construction — a sensibility aligned with the craft jewellery tradition that values transparency of making. The rivet head may be left with the texture of the hammer face, polished to a high finish, or oxidised to contrast with the surrounding metal.

Cold riveting is also the standard method for attaching non-metallic elements that cannot be soldered: slices of boulder opal, drusy quartz, fossilised material, carved bone, or sheet acrylic can all be incorporated into a metal framework using rivets passing through pre-drilled holes in both the inlay and the bezel or frame. In such applications, the rivet must be sized and tightened with particular care, as brittle materials will crack if over-clamped.

Articulated jewellery — pieces with moving parts, such as segmented collars, kinetic pendants, or linked bracelets — relies on tube rivets functioning as pivot pins. Here the rivet is deliberately left with a small amount of rotational freedom rather than clamped tight, and the tube walls are flared only enough to retain the link without binding it.

Relationship to Soldering and Other Joining Methods

Cold riveting occupies a complementary rather than competing position relative to soldering in the jeweller's technical vocabulary. Soldering produces an invisible, metallurgically continuous joint and is preferred wherever structural strength and aesthetic seamlessness are paramount. Cold riveting is chosen when heat is contraindicated — whether to protect a heat-sensitive adjacent material, to preserve a patina or surface treatment already applied, to avoid the risk of fire-stain on silver, or simply because the piece has already been polished and set. It is also the only practical option for joining dissimilar metals that do not solder compatibly, or for attaching non-metallic components.

Mechanical connections more broadly — including tabs, prongs, and press-fits — share with cold riveting the virtue of reversibility in principle, though a well-peened rivet is in practice permanent. Where genuine reversibility is required, a screw fitting or a friction-fit tube is preferable.

Historical Context

Riveted metalwork predates soldering in the archaeological record. Iron Age and Bronze Age artefacts — armour, vessels, harness fittings — were routinely assembled with rivets, and the technique passed without fundamental change into medieval goldsmithing and armour-making. In jewellery specifically, riveted hinges and articulated elements appear in ancient Egyptian, Greek, and Roman goldwork. The industrial revolution standardised rivet forms and introduced machine-set rivets for mass-produced findings, but the hand-peened rivet of the studio jeweller remains essentially the same operation performed by a craftsman several millennia ago.

Further Reading

• Gems & Gemology — GIA Publications
• Ganoksin: Riveting in Jewellery