Old Single Cut — The Antique Small-Diamond Brilliant
Old Single Cut — The Antique Small-Diamond Brilliant
A simplified 17- or 18-facet brilliant cut used for the small accent diamonds of Georgian, Victorian, and Edwardian jewellery
The old single cut is a simplified brilliant cut used principally for small diamonds — typically under about 0.10 carat — in Georgian, Victorian, and Edwardian jewellery. It comprises a table, eight crown facets, eight pavilion facets, and (in most examples) a culet, for a total of 17 or 18 facets depending on whether the culet is counted. The cut was the standard treatment for small accent diamonds during the period before the diffusion of mass-produced full-cut brilliants, and it survives in enormous numbers in surviving antique jewellery, distributed across rings, brooches, and pavé settings of the eighteenth, nineteenth, and early twentieth centuries.
Why a simpler cut
Small diamonds in pavé and similar accent applications do not need — and in fact cannot productively use — the 58-facet pattern of a full brilliant. At small sizes, the additional facets become so small that they no longer return distinct flashes of light; they degrade into a confused glitter that the eye reads as a single bright zone rather than as articulated scintillation. The single cut, with its simpler facet arrangement, produces clean, broad flashes that read effectively at the small scale. The cut is also faster and more economical to produce by hand than a full brilliant, an important consideration when a single piece of jewellery might require dozens or hundreds of small diamonds.
How they were cut
Old single cuts were produced by hand on bow-driven scaifes, with the cutter working from rough by eye and judgement. The simpler facet pattern made the work faster than full brilliant cutting but did not reduce the demand for skill: the small size of the stone left no margin for error, and the cutter needed to produce consistent proportions across batches of dozens of stones for a single jewel. The slight irregularities of handwork are visible at high magnification and contribute to the characteristic visual signature of antique pavé.
In the contemporary trade
Old single cuts are encountered principally in surviving antique jewellery rather than as loose stones. They are an important element in the period-correct restoration of Georgian, Victorian, and Edwardian pieces, where replacing a damaged or missing single cut with a modern full-cut brilliant or a swiss-cut would compromise the historical character of the jewel. Specialist suppliers maintain stocks of old single cuts of various sizes for restoration work, and contemporary cutters occasionally produce new single cuts to match historic stones in significant restoration projects.
For new jewellery design, the single cut is largely obsolete, having been displaced by the full-cut brilliant for any accent diamond above the smallest sizes and by the eight-cut (a closely related variant with marginally different facet proportions) at the smallest scales. Where a vintage character is desired in a new piece, designers may specify single cuts as accent stones to capture the soft, broad-flash visual character.