Bullet Cut
Bullet Cut
A tapered step-cut form combining rectilinear discipline with a single curved terminus
The bullet cut is a step-cut gemstone shape characterised by one straight edge — typically the girdle edge nearest the central stone in a composition — and one rounded, pointed, or bluntly curved end that gives the outline its name. In cross-section the stone tapers from a wider straight base toward a narrower curved apex, producing a silhouette that resembles a stylised projectile or, depending on the degree of curvature, a half-moon. Like all step cuts, the bullet relies on parallel, rectilinear facet rows arranged in tiers on both crown and pavilion rather than the radiating kite-and-star arrangement of brilliant-cut stones. The result is a stone that prizes transparency, depth of colour, and the quiet play of broad reflections over the scintillating sparkle of brilliant cutting.
Geometry and Facet Architecture
A standard bullet cut presents three to five step facets on the crown and a corresponding set on the pavilion, with a table facet occupying the upper face and a small culet or flat base closing the pavilion. The straight girdle edge is parallel to the table's long axis, while the curved end sweeps around in a single arc. The taper — the narrowing from the straight edge to the curved terminus — is the defining geometric feature that distinguishes the bullet from a simple half-moon, in which the curve is more pronounced and the overall outline is more symmetrical. In practice the boundary between the two shapes is not rigidly codified; cutters and dealers sometimes use the terms interchangeably when the curvature is moderate.
Because the pavilion facets must follow the tapering outline, the cutter must carefully manage the angles at the curved end to prevent windowing — the glassy, transparent zone that appears when pavilion angles are too shallow to achieve total internal reflection. Well-executed bullet cuts maintain consistent pavilion angles across the full width of the stone, a task complicated by the asymmetry of the outline. In diamonds, pavilion angles in the range of 40–43 degrees are typical for step-cut side stones of this family, though the exact values are adjusted to the proportions of each individual piece.
Historical and Stylistic Context
The bullet cut belongs to the broader family of calibrated step-cut side stones — alongside the baguette, tapered baguette, trapeze, and half-moon — that came to prominence during the Art Deco period of the 1920s and 1930s. Art Deco jewellery design placed a premium on geometric precision, architectural line, and the visual contrast between a dominant central stone and flanking elements that supported rather than competed with it. The bullet cut, with its clean straight edge that could be set flush against a central oval, pear, or marquise stone, served this compositional logic well. Its curved end allowed the mounting to resolve gracefully at the shoulder of a ring or at the terminus of a brooch motif without the abrupt right-angle termination of a baguette.
Contemporary jewellery design has sustained and in some respects intensified interest in the bullet cut. Three-stone rings — in which a central round brilliant, oval, or cushion is flanked by two matching side stones — frequently employ bullets when the designer wishes to echo a curved outline at the shoulders. The straight inner edges of the two bullets align with the girdle of the central stone, while the curved outer ends define the ring's shoulder profile. This arrangement is particularly common in engagement ring design, where the bullet's restrained step-cut character provides a counterpoint to a brilliant-cut centre without introducing the visual competition that a second brilliant might create.
Diamond as the Predominant Material
Bullet cuts are produced overwhelmingly in diamond. The reasons are partly optical and partly commercial. Diamond's high refractive index (approximately 2.417) and strong dispersion mean that even a step-cut stone with broad, quiet facets can produce attractive internal reflections and occasional flashes of spectral colour. More practically, the bullet is a calibrated side-stone shape: it is produced in standardised millimetre dimensions so that pairs can be matched and set symmetrically without custom fitting. The diamond cutting centres of Antwerp, Surat, and New York all produce calibrated bullet cuts in standard size runs, and the shape is listed in the grading nomenclature of major laboratories including the Gemological Institute of America.
Colour and clarity grading of bullet-cut diamonds follows the same GIA scales applied to other shapes, though the step-cut facet arrangement makes inclusions and colour more visible to the eye than in brilliant cuts of equivalent grade. Trade practice generally favours VS clarity or better for bullet-cut side stones intended for fine jewellery, and colour grades of G or higher when the stones are to be set alongside a near-colourless or colourless centre.
Coloured Stones in Bullet Cut
Although far less common than in diamond, the bullet cut does appear in coloured gemstones, most notably in sapphire and occasionally in spinel, aquamarine, and tourmaline. In coloured stones the step-cut architecture serves a different optical purpose: rather than maximising brilliance, it allows the body colour to read clearly and evenly across the face of the stone. A well-cut bullet-shaped sapphire flanking a central oval sapphire can create a unified colour field across the face of a ring, an effect that a brilliant-cut side stone — with its fragmented, directional reflections — would disrupt.
Cutting coloured stones into bullet form presents additional challenges because rough is rarely available in shapes that yield the tapered outline without significant weight loss. The economics of coloured-stone cutting, in which rough is priced by weight and cutting is labour-intensive, mean that calibrated bullet cuts in fine sapphire or spinel command a meaningful premium over equivalent-weight rounds or ovals. Custom-cut bullets in matched pairs for bespoke commissions are correspondingly expensive.
Setting Considerations
Bullet cuts are almost universally set in channel or bezel settings rather than prong settings. The straight edge is typically held in a channel rail or a straight bezel wall, while the curved end is enclosed in a curved bezel or a pair of closely spaced prongs. Channel setting is preferred in commercial production because it protects the girdle, maintains the calibrated spacing between stones, and presents a clean, uninterrupted surface. In high jewellery contexts, individual rub-over or partial bezel settings are sometimes used to allow more light into the pavilion.
The orientation of the bullet in the mounting is significant. When used as a shoulder stone in a three-stone ring, the straight edge faces inward toward the central stone and the curved end faces outward toward the shank. This orientation ensures that the taper of the bullet echoes and frames the curve of the central stone's girdle, creating a visually integrated composition. Reversing the orientation — curved end inward, straight edge outward — is occasionally done for stylistic effect but is less conventional.
Relationship to Adjacent Shapes
The bullet cut sits within a continuum of tapered and curved step-cut shapes. At one extreme, the tapered baguette is entirely rectilinear: both long edges are straight, and the stone simply narrows from one end to the other. At the other extreme, the half-moon has a pronounced semicircular curved edge and a straight diameter edge, with little or no taper. The bullet occupies the middle ground, combining the taper of the baguette with the curved terminus of the half-moon. In trade catalogues and laboratory reports, the three shapes are sometimes grouped under the heading of "fancy step cuts" or "calibrated step-cut side stones," and the precise classification of a borderline stone may vary between graders.