A cold connection is any mechanical method of joining metal or mixed-material components in jewellery without the application of heat, solder, or adhesive. The term encompasses a broad family of techniques — rivets, screws, bolts, tabs, staples, interlocking slots, and wire wrapping — united by a single defining principle: the joint is achieved through physical force, friction, or geometric interlock rather than fusion or chemical bonding. Cold connections have been employed since antiquity, appearing in Iron Age fibulae and Roman military fittings, but the technique has undergone a significant revival in contemporary studio jewellery, where it is prized for its design versatility and its capacity to unite materials that cannot survive the heat of a torch.

Why Cold Connections Matter

The fundamental advantage of cold connection is material compatibility. Soldering and fusing require temperatures that range from roughly 180 °C for soft solders to well above 700 °C for silver and gold hard solders. Many of the materials that interest contemporary jewellers — thermoplastics, acrylic sheet, wood, bone, shell, leather, resin, anodised aluminium, and low-melting alloys such as pewter — would char, warp, or disintegrate at those temperatures. Cold connection allows a goldsmith to marry a sheet of translucent acrylic to a sterling silver frame, or to set a slice of fossilised wood within a copper bezel that is mechanically folded rather than soldered closed, without compromising either material.

Beyond material compatibility, cold connections offer a degree of reversibility that fused joints cannot. A riveted or screwed assembly can, in principle, be disassembled for repair, stone replacement, or reconfiguration — a practical consideration in studio and bespoke work where the maker may wish to retain access to individual components over the life of a piece.

Principal Techniques

Rivets

The rivet is the most fundamental cold connection. A wire or rod of metal — typically the same alloy as the surrounding metalwork, though contrasting metals are used decoratively — is passed through pre-drilled or pierced holes in the components to be joined. The protruding ends are then work-hardened and spread by hammer blows, forming a head on each side that clamps the layers together. The wire diameter must fit the hole snugly to prevent rotation; a loose fit produces a weak, rattling joint.

Several rivet variants are in common studio use:

• Flush rivet: the hole is countersunk so that the rivet head sits level with the surrounding surface, producing a clean, unobtrusive joint.
• Domed or decorative rivet: the wire end is left proud and formed into a small dome or ball, becoming a visible design element.
• Tube rivet: a short length of tubing replaces solid wire; the tube walls are flared outward with a burnisher or punch. Tube rivets exert less clamping force than solid rivets but create a neat, consistent head and are well suited to thinner gauges.
• Snap rivet (pop rivet): a commercial finding used in industrial and fashion jewellery; less common in fine studio work.

Screws and Threaded Connections

Miniature screws — either commercially sourced or hand-cut using a tap-and-die set — allow components to be fastened and unfastened repeatedly. In fine jewellery, threaded connections appear in interchangeable pendant systems, modular brooches, and certain watch-related accessories. The technique demands precision drilling and tapping, and the threads must be cut cleanly to avoid stripping. Stainless steel, titanium, and fine silver are among the metals commonly threaded at the bench scale.

Tabs and Prongs

A tab connection involves cutting or filing a narrow tongue of metal from one component and folding it through a corresponding slot in another, then bending the tab flat against the reverse face. The technique is rapid and requires no additional material, but the joint is generally less robust than a rivet and may loosen with wear. Tabs are widely used in production costume jewellery and in educational contexts as an introduction to cold-connection principles. The bezel — strictly speaking a form of tab or prong system — is the classic cold-set stone-holding device, though in fine jewellery the bezel strip is almost always soldered to the base before the stone is set.

Staples and Wire Wrapping

U-shaped staples of heavy-gauge wire can be passed through drilled holes and bent flat to secure layers of material, functioning much like a rivet with a rectangular cross-section. Wire wrapping — coiling fine wire around a junction or through drilled holes — is among the oldest joining methods known and remains a legitimate cold connection when executed with sufficient tension and coverage to prevent movement.

Interlocking Slots and Puzzle Joints

Pierced or sawn slots that interlock in a tongue-and-groove or jigsaw configuration allow flat sheet components to be assembled without any additional fastener. The joint relies on the geometry of the cut to resist separation in multiple axes. This approach is particularly effective in kinetic jewellery and in pieces where the joint itself is intended to be a visible structural feature.

Materials Commonly Joined by Cold Connection

The range of materials that benefit from cold connection is broad:

• Thermoplastics (acrylic, polycarbonate, nylon) and thermoset resins
• Wood, bamboo, and other cellulosic materials
• Bone, antler, shell, and other organic materials
• Anodised aluminium and titanium, where heat would destroy the oxide colour layer
• Niobium, which is difficult to solder by conventional means
• Leather and textile elements incorporated into mixed-media work
• Ceramic and glass components that cannot withstand thermal shock
• Low-melting alloys (pewter, britannia metal) used in art jewellery

Design and Aesthetic Considerations

In contemporary studio jewellery, the cold connection is frequently treated as a deliberate aesthetic statement rather than a hidden necessity. Exposed rivet heads in contrasting metals, visible screw heads in oxidised silver, or boldly oversized tabs become part of the visual language of a piece, communicating something about process, materiality, and the maker's hand. This transparency of construction aligns with a broader tendency in craft jewellery to celebrate rather than conceal the evidence of making.

The technique also invites a certain industrial or architectural sensibility. Jewellers working in the tradition of the Bauhaus or influenced by product design often employ cold connections to evoke the vocabulary of engineered objects — bridges, aircraft skins, precision instruments — within the intimate scale of wearable work.

Practical Considerations at the Bench

Successful cold connections depend on careful preparation. Holes must be drilled to a diameter that matches the rivet wire or screw shank precisely; a gap of even a few tenths of a millimetre will allow rotation and eventual loosening. Layers must be clamped firmly together before the rivet is set, to prevent gaps forming between components. The metal used for rivets should be sufficiently ductile to spread without cracking; fine silver, fine gold, copper, and annealed brass are all well suited, while work-hardened or brittle alloys may fracture under the hammer.

Where cold connections are used with non-metal materials, the designer must account for differential thermal expansion: a rivet set tightly through acrylic and silver at room temperature may loosen in summer heat as the acrylic expands at a higher rate than the metal, or may crack the acrylic if set too tightly. Leaving a small tolerance, or using a tube rivet that distributes clamping force over a larger area, mitigates this risk.

Historical and Contemporary Context

Mechanical joinery predates soldering in the archaeological record. Bronze Age sheet-metal work — helmets, shields, vessels — frequently employed riveted construction, and the technique persisted through the medieval period in armour-making and in the construction of reliquaries and book covers. The industrial revolution standardised riveted construction at architectural and engineering scales, and the aesthetic of the rivet entered the visual culture of the nineteenth and twentieth centuries through bridges, boilers, and the hulls of iron ships.

In studio jewellery, the deliberate adoption of cold connection as a primary technique is associated with the post-war craft revival and, more specifically, with the emergence of art jewellery movements in Europe and North America from the 1960s onwards. Makers working outside the conventions of fine jewellery sought techniques that matched their expanded material palette, and cold connection provided a structurally sound, intellectually coherent answer. Today it is a standard component of the curriculum at most jewellery schools and a well-documented technique in the professional literature of the field.

Further Reading

• Ganoksin: Cold Connections — techniques and applications
• GIA Gems & Gemology — jewellery arts and techniques