Rectangular Wire
Rectangular Wire
Flat-section drawn wire used for bezels, gallery work, and structural elements
Rectangular wire, also called flat wire, is wire of rectangular cross-section produced by drawing round wire through progressively rectangular dies, by rolling round wire through a flat mill, or by extruding from cast stock. It is one of the standard intermediate forms in jewellery fabrication and supplies the goldsmith with stock for bezels, gallery wire, ring shanks, channel walls, and any application where a flat face or controlled edge is required. The term covers a wide range of dimensions and width-to-thickness ratios, with finished gauges chosen to suit the specific use.
Production
Rectangular wire is most often produced by drawing. A round wire is pulled through a draw plate fitted with rectangular openings of progressively narrower dimensions, with annealing between passes to manage work-hardening. The drawing operation refines grain structure and produces a smoother surface finish than rolling alone. Alternatively, round wire can be flattened in a rolling mill fitted with smooth rolls, producing a strip whose width-to-thickness ratio depends on the reduction; a square wire rolled flat tends to produce a wider strip than a drawn rectangle of equivalent gauge.
Common width-to-thickness ratios for jewellery rectangular wire range from 1 to 2 — close to a square section — through 1 to 5 for ribbon wire used in bezels, up to 1 to 10 or more for narrow strip used in fine gallery work and inlay. Available alloys include sterling silver, all standard carat-weights of yellow, white, and rose gold, platinum, palladium, and gilding metals.
Uses in fabrication
The most common use is bezel work. Rectangular strip is wrapped around a stone, soldered along the seam, and attached to a backing plate; the flat outer face takes a clean edge after burnishing, and the inner face contacts the stone smoothly. The width of the strip controls how high the bezel sits and how much metal is left to push over after the stone is seated. For thin bezels around fragile stones, narrow ribbon wire is preferred; for protective bezels around hardstone or large coloured stones, taller strip with substantial wall thickness is used.
Gallery wire — the decorative strip that frames the underside of a setting — is typically rectangular wire that has been pierced, milled, or stamped with a repeating pattern. The flat faces accept patterning more readily than round wire and present a continuous decorative edge once assembled. Ring shanks built from rectangular stock have a comfortable inside surface and a square-edged outside profile that takes engraving and milgrain work cleanly. Channel walls in channel-set bands are similarly rectangular for the same reasons.
Working properties
Rectangular wire resists twisting better than round wire of equivalent cross-sectional area because the moment of inertia is asymmetrical — the wire bends more readily across the thin dimension than along it. Goldsmiths exploit this directionality when bending bezels around stones with sharp corners or making rings with non-circular cross-sections. The corollary is that drawing or pulling rectangular wire to refine its dimensions requires careful die selection to maintain a true rectangular section without twist.
Soldering rectangular wire to sheet metal is straightforward because the flat face provides full contact with the substrate, unlike round wire which contacts only along a single line. This makes rectangular wire the preferred stock for any soldered application where joint strength and clean fillet appearance matter.
In the trade
Trade suppliers offer rectangular wire in a wide range of standard gauges; bench jewellers also produce it as needed by drawing or rolling round stock. Specifying rectangular wire in a fabrication brief requires both width and thickness, the alloy, and the temper — soft for forming, half-hard for shanks and structural elements. The flat profile is associated with clean, modern design vocabulary as well as with traditional techniques, making it equally relevant to contemporary and period styles.