Portrait Cut — The Thin, Flat Stone Over a Miniature
Portrait Cut — The Thin, Flat Stone Over a Miniature
An eighteenth-century cutting style designed to protect rather than refract
The portrait cut is a thin, flat gemstone cut with a large table and minimal pavilion depth, historically used to cover a miniature portrait, silhouette, or sentimental hair work in lockets, rings, and brooches. Portrait-cut stones are typically 1 to 2 millimetres thick and were fashioned from transparent material — most commonly rock crystal, but also diamond, pale sapphire, and aquamarine — chosen specifically to allow the underlying image to remain visible while protecting it from wear, abrasion, and moisture. The cut is also called the lasque in some literature, particularly in the South Asian context, and overlaps with the broader table cut family in cataloguing practice.
Function and form
The portrait cut is a functional rather than optical cut: its purpose is transparency and surface area, not brilliance. The standard form is a flat slab with a slight dome or step on the table surface, faceted modestly around the girdle, and thin enough that the entire stone reads as a transparent window over whatever sits beneath. The pavilion is reduced to a shallow chamfer or eliminated entirely; cleavage and crystal habit dictate the practical lower limit on thickness, with diamond examples occasionally pushed below one millimetre.
For diamond, the portrait cut was typically fashioned from naturally flat macles (flat triangular twins) and from cleavage fragments that did not support deeper cutting. The cutter's task was to polish the table flat without losing the cleavage fragment to fracture, and to dress the girdle so that the stone could be set into a bezel or collet over the underlying miniature. The yield from rough was poor, and portrait-cut diamonds were a relatively scarce production category even in their period of fashion.
Period and use
The portrait cut had its principal period of use in the seventeenth and eighteenth centuries, coinciding with the broader fashion for portrait miniatures, silhouettes, and sentimental jewellery containing locks of hair, monograms, or memento-mori imagery. The cut allowed a wearer to display a portrait of a beloved, an absent family member, or a deceased relative in a setting that protected the underlying image from contact while keeping it continuously visible.
The form persisted into nineteenth-century Romantic-era jewellery, particularly in mourning and sentimental work, and is found in some Georgian and Regency English jewellery as well as Continental and Indian production. South Asian lasque-cut diamonds appear in Mughal and Rajput jewellery from the seventeenth century onward, often set in kundan-technique gold over enamel grounds, and serve a related decorative function — a flat, broad expanse of diamond emphasising surface coverage rather than facet brilliance.
Identification and condition
Portrait-cut stones are identified by their characteristic thinness, the ratio of table to total depth, and the simple girdle dressing. In antique work, the cut is most often encountered set over a miniature, locket compartment, or hair-work composition; loose portrait-cut stones occasionally appear in estate parcels, where they may be cut up and recut into modern proportions or sold to specialists. Diamond examples in original mountings are valued primarily for their historical context rather than for optical performance.
Condition concerns include chipping at the thin girdle, which is vulnerable to impact, and fracture along cleavage planes in diamond. Bezel settings rather than prongs are appropriate to the form, both historically and in any contemporary remounting work.
In the trade
The portrait cut occupies a niche in the antique-jewellery market, with collectors of Georgian, Regency, and early Victorian sentimental jewellery the principal buyers. Pricing rests on the underlying setting, the condition of the miniature or hair-work composition, and the documentation of provenance rather than on the stone's per-carat value in conventional cut-quality terms. The cut is documented in the V&A, the British Museum, and major decorative-arts collections.