A chevee is a cabochon variant distinguished by a concave, dished, or inwardly curved upper surface in place of the rounded convex dome that defines the standard cabochon form. Where a conventional cab rises to a smooth crest, the chevee retreats — its crown scooped inward so that the stone presents a shallow bowl or hollow to the viewer. The term appears primarily in historical lapidary and gem-cutting manuals and among specialist carvers; it is rarely encountered in contemporary commercial gemmological literature, though the cutting technique itself remains in active, if limited, use.

Defining Characteristics

The essential distinction between a chevee and a standard cabochon lies entirely in the geometry of the crown. The base, girdle outline, and general proportions of a chevee may be identical to those of any conventional cab — oval, round, cushion, or freeform — but the upper surface curves inward rather than outward. The degree of concavity varies considerably: some chevees are only slightly dished, producing a subtle optical effect, while others are deeply hollowed to the point of forming a near-hemispherical cavity. The base of a chevee is typically flat, as with most cabochons, though a shallow dome on the pavilion is not unknown.

The concave crown distinguishes the chevee from two related but distinct forms. The hollow cab — sometimes used as a near-synonym — more often refers to a cabochon that has been entirely hollowed from the reverse to reduce weight, leaving the crown convex but the pavilion open or thinned. The chevee, by contrast, places the concavity on the visible face. Confusion between these terms is understandable and appears even in specialist sources, so context is essential when encountering either designation in trade or historical documents.

Purposes and Applications

The chevee cut serves several distinct practical and aesthetic ends, and understanding these purposes clarifies why a cutter would choose this unconventional form.

• Weight reduction in dense materials. Certain gem materials — rhodonite, malachite, hematite, and some garnets — carry significant specific gravity. Removing material from the crown reduces the finished weight of the stone and, by extension, the weight burden on a setting. This consideration is particularly relevant in large statement pieces where a heavy stone might compromise the structural integrity or wearability of a mount.
• Enhancement of translucency. Thinning the crown of a stone that sits between opaque and translucent — fine chalcedony, certain agates, pale chrysoprase, or thinly banded materials — can coax a degree of light transmission that a full dome would suppress. The concave surface reduces the path length through which light must travel, allowing a glow or inner luminosity to emerge that would otherwise be lost.
• Creation of a decorative receptacle. The hollow formed by the concave crown can serve as a functional recess for inlay work, enamel, resin, or a secondary stone. In this application the chevee becomes a structural element of a composite jewel rather than a self-contained gem. Historical examples of this approach appear in certain Renaissance and Baroque jewellery traditions, where carved stones were combined with enamel grounds or secondary materials set within their cavities.
• Optical and reflective effects. A concave surface interacts with light in a fundamentally different manner from a convex one. Rather than dispersing reflected light outward across a dome, the concave crown tends to concentrate and redirect it, producing a distinctive, slightly mirror-like quality in highly polished specimens. In some materials this creates an illusion of depth or an unusual luminous focus at the centre of the stone.

Materials Suited to the Chevee Cut

Because the chevee is a lapidary rather than a faceted form, it is applied to the same range of materials that accept cabochon cutting generally: opaque, translucent, and occasionally near-transparent stones whose optical properties are better served by a smooth polished surface than by faceting. Dense opaque materials such as malachite, rhodonite, and hematite are logical candidates for weight-reduction chevees. Translucent chalcedonies, agates, and chrysoprase benefit from the thinning effect. Softer carving materials — serpentine, steatite, and certain feldspars — lend themselves to the form because their moderate hardness makes concave grinding and polishing more tractable.

Highly transparent facetable materials are seldom cut as chevees, since the concave crown would interfere with the internal light paths that make such stones desirable. There are, however, artistic exceptions: some contemporary lapidary artists have applied concave surfaces to quartz and even to lower-grade corundum as a deliberate sculptural choice rather than a conventional gem-cutting decision.

Cutting Technique

Producing a chevee requires the use of curved grinding wheels or specially profiled laps — tools that can cut inward rather than across a flat or convex surface. Historically, this was achieved with small, rounded abrasive wheels turned on a lathe-like apparatus. In contemporary lapidary practice, ball-shaped diamond burrs, concave-profiled grinding wheels, and flexible abrasive tools mounted in rotary handpieces are the standard means. Achieving a uniform, symmetrical concavity demands considerable skill; any irregularity in the curvature becomes immediately visible in the finished polish. Polishing a concave surface presents its own challenges, as conventional flat laps cannot follow the inward curve, requiring the use of shaped felt, leather, or wooden polishing tools charged with appropriate compounds.

Historical and Trade Context

The term chevee does not appear with consistency across gemmological literature, and its etymology is not definitively established in standard gemmological references. It surfaces in older lapidary manuals — particularly those of the late nineteenth and early twentieth centuries — as a designation for this concave-crowned form, and it has been preserved in the vocabulary of specialist carvers and some auction-house cataloguers describing antique jewels. The relative obscurity of the term in contemporary usage reflects the rarity of the cut itself: the chevee is a specialist form, produced in small numbers by carvers with the skill and equipment to execute it, and encountered most often in art jewellery, bespoke commissions, and historical pieces rather than in standard commercial gem production.

Collectors and curators encountering the term in auction catalogues or estate inventories should treat it as a signal that the stone in question has been cut to an unusual specification, likely for one of the functional or aesthetic reasons outlined above, and that its weight, optical behaviour, and setting requirements will differ from those of a standard cabochon of comparable dimensions.

Relationship to Related Forms

The chevee sits within a broader family of non-standard cabochon variants that includes the hollow cab, the double cabochon (convex on both faces), and the tallow-top (a very low, nearly flat dome). What unites these forms is a shared departure from the canonical single-convex-dome geometry that defines the cabochon in its most familiar expression. Among these variants, the chevee is arguably the most technically demanding to execute and the most visually distinctive, since its concave crown is immediately apparent and produces optical effects that no other standard cutting form replicates.