Double Cut
Double Cut
A seventeenth-century stepping stone between the single cut and the modern brilliant
The double cut is an early brilliant-style faceting arrangement developed during the seventeenth century as a systematic refinement of the single cut and, in some accounts, as a parallel development to the Mazarin cut. In its canonical form it presents sixteen facets on the crown and sixteen on the pavilion, together with a flat table and a small culet, yielding thirty-four facets in total. Though it never achieved the optical efficiency of the later old mine cut or the modern round brilliant, the double cut represents a decisive moment in the history of diamond fashioning: the point at which cutters began to treat the crown and pavilion as complementary optical systems rather than simply as surfaces to be polished.
Historical Development
Diamond cutting in Europe before the mid-seventeenth century was largely confined to the point cut — which preserved the natural octahedral crystal — and the table cut, which simply ground one apex flat. The single cut, sometimes called the eight cut, added eight crown facets and eight pavilion facets to the table and culet, producing a stone of modest brilliance. The double cut doubled this complement of facets, subdividing each of the single cut's main crown and pavilion facets into two, thereby increasing the stone's capacity to refract and reflect light without yet arriving at the more complex star-facet and girdle-facet arrangements that define later brilliant styles.
The precise relationship between the double cut and the Mazarin cut — attributed by tradition to Cardinal Jules Mazarin of France, who is said to have encouraged the development of a seventeen-facet crown arrangement in the mid-seventeenth century — is a matter of some scholarly nuance. Some gemmological sources treat the Mazarin as a distinct, slightly more advanced configuration; others regard the double cut and the Mazarin as near-synonymous terms for the same transitional form. What is clear is that both belong to the same generation of experiment, conducted primarily by Flemish and Dutch lapidaries working in Antwerp and Amsterdam, who were refining their tools and techniques in response to growing demand from European courts for diamonds of greater fire and brilliance.
Facet Arrangement and Geometry
In the standard double cut the crown carries:
- One table facet
- Eight bezel (kite) facets arranged around the table
- Eight triangular half-facets (sometimes called skill facets or upper-girdle facets) meeting the girdle
The pavilion mirrors this logic with eight main pavilion facets and eight lower-girdle facets converging at the culet. The girdle itself is typically faceted or at least lightly polished, though in many surviving antique examples it is left bruted — rough — in keeping with the workshop practices of the period.
The proportions of double-cut stones vary considerably because seventeenth-century cutters worked without standardised proportion tables, optimising by eye and by the constraints of the rough crystal. Crown angles tend to be steep by modern standards, and tables are often relatively small, both features that reduce the stone's brightness compared with a well-proportioned modern brilliant but that contribute to a characteristic warmth and depth of reflection that many collectors find appealing.
Optical Performance
With only thirty-four facets the double cut cannot achieve the complex light-return patterns of the fifty-eight-facet modern round brilliant. Light entering through the table and bezels is refracted and partially returned through the crown, but leakage through the pavilion is significant by contemporary standards. The visual effect is one of broad, soft flashes rather than the sharp, scintillating pinpoints associated with modern cutting. In candlelight — the illumination for which these stones were effectively designed — the double cut performs with considerable charm, producing warm, diffuse reflections that suit the low-intensity, directional light of a flame.
Identification in Antique Jewellery
Double-cut diamonds are occasionally encountered in seventeenth- and early eighteenth-century jewellery, particularly in pieces of Dutch, Flemish, English, and French origin. They may also appear as accent stones in later antique pieces where a cutter or jeweller recycled earlier-fashioned diamonds. Identification relies on facet counting — straightforward under a loupe — combined with assessment of the overall silhouette, which is typically circular to slightly irregular rather than the precise round of a modern brilliant. The culet, when present, is usually visible to the naked eye as a small circle at the base of the stone, a feature shared with old mine and old European cuts.
Gemmological laboratories do not routinely issue cut-grade reports for double-cut stones in the manner applied to modern rounds; assessment is instead descriptive, noting the cut style, estimated period, and condition of the facets. Wear on the facet junctions — a gentle rounding of the arrises — is common in genuinely old stones and can assist in distinguishing period examples from modern reproductions cut in antique styles.
Collector and Market Context
Interest in antique diamond cuts has grown steadily since the early 2000s, driven partly by collectors seeking stones with historical provenance and partly by a broader appreciation of the distinctive optical character that pre-modern cuts offer. The double cut, being rarer in the market than the more abundant old mine and old European cuts, tends to appear at specialist auction houses and through dealers with expertise in antique jewellery rather than in mainstream retail channels. Prices reflect rarity and historical interest as much as the conventional weight-and-clarity metrics applied to modern stones.
When encountered as accent or side stones in period settings — surrounding a central table-cut or rose-cut stone in a seventeenth-century brooch or pendant, for example — double-cut diamonds are generally left in their original form by responsible conservators. Recutting to a modern brilliant would destroy historical evidence and, in most cases, result in significant weight loss from a stone that is already likely to be small.