Old Mine Cut — The Eighteenth-Century Cushion Brilliant
Old Mine Cut — The Eighteenth-Century Cushion Brilliant
The cushion-outlined diamond cut that preceded the round brilliant and defined Georgian and early Victorian jewellery
The old mine cut is the earliest fully developed brilliant-cut style for diamond, fashioned predominantly during the eighteenth and nineteenth centuries before the diffusion of mechanised bruting and the standardisation of the round brilliant. It is characterised by a cushion-shaped outline — a square or rectangular form with strongly rounded corners, sometimes approaching circular — together with a high crown, a small table, a large open culet, and 58 facets cut by hand. The name mine cut is generally understood to derive from the Indian and Brazilian diamond mines that were the principal sources of rough diamond during the period when the cut was developed. The closely related variant old miner cut is a synonym; the two terms are interchangeable in the trade.
Stylistic features
The defining feature of the old mine cut is its cushion outline, which preserves more of the natural shape of an octahedral diamond crystal than the round outline of later cuts. The corners are rounded but not eliminated, giving the stone a softer rectangular character that is distinct from both the geometrically pure cushion-modified brilliant of contemporary cutting and the fully circular old European cut. The crown is typically high, the table small (often 40 to 50 per cent of the average girdle dimension), and the culet large and clearly visible through the table when the stone is viewed face-up. The 58-facet pattern — table, eight crown bezel facets, eight star facets, sixteen upper girdle facets, sixteen lower girdle facets, eight pavilion main facets, and culet — is the same pattern that was retained in the old European and modern round brilliant cuts.
Cutting practice
Old mine cuts were produced on bow-driven scaifes — horizontal cast-iron lap wheels turned by a string-and-bow mechanism — using the cutter's eye and judgement rather than calculated proportions. The cushion outline was a natural consequence of working from octahedral rough crystals: the cutter rounded the four corners of the octahedron's table-down orientation and worked the crown and pavilion to fit, preserving as much weight as possible while removing only enough material to achieve a faceted form. The result is a population of stones with substantial individual variation in proportions, outline regularity, and facet placement. Two old mine cuts of the same period and weight will often look noticeably different, and the visual character of the individual stone matters more than any abstract proportion grid.
Optical character
Old mine cuts produce a distinct optical signature: chunky flashes of broad spectral colour, slow scintillation, and a contemplative play of light that depends heavily on the lighting environment. Under candlelight or warm tungsten — the lighting for which the cut was developed — old mine cuts can be extraordinarily beautiful, with broad fans of fire and a luminous, flickering character. Under cool LED or modern showroom lighting, the older cuts perform less brightly than modern brilliants by measured light return, but for many viewers the romantic character compensates more than completely.
Period context
Old mine cuts dominate the diamond jewellery of the Georgian and Victorian periods. They are the standard cut found in eighteenth-century closed-back silver-set jewels, in nineteenth-century rivière necklaces, and in the early Victorian engagement and mourning rings whose surviving examples now circulate in the antique trade. The transition to the round outline of the old European cut occurred gradually from the late nineteenth century, accelerating with the diffusion of bruting machinery; the two cuts overlapped in production for several decades.
In the contemporary market
Loose old mine cuts trade at the standard old-cut discount to modern round brilliants — typically 10 to 30 per cent — although well-cut examples with strong character now command less of a discount than they did a generation ago. Old mine cuts in their original Georgian or Victorian settings carry the antique-jewellery premium and are valued primarily as historic objects. Designer commissions sometimes incorporate loose old mine cuts as the centre stone of contemporary settings, capturing the vintage character without the antique premium.
Care
The open culet of an old mine cut leaves the stone slightly more vulnerable to chipping at the culet point and table edges than a modern brilliant with a pointed or extremely small culet. We recommend gentle ultrasonic cleaning, periodic professional inspection, and conservative handling around hard surfaces.