The Ashoka cut is a proprietary cushion-modified brilliant developed and trademarked by the New York diamond house William Goldberg. Characterised by a distinctly elongated rectangular outline with softly rounded corners and a facet arrangement of 62 facets, the cut is engineered to deliver exceptional brilliance while preserving maximum weight from suitable rough crystals. It occupies a rare position in the contemporary diamond trade: a named proprietary cut with a documented historical namesake, a verifiable pedigree, and a consistent optical specification that distinguishes it from the broader category of cushion-modified brilliants.

Origin and Namesake

The cut takes its name from the Ashoka diamond, a historic stone of Indian provenance whose recorded weight in its recut form is 41.37 carats, graded D in colour and Flawless in clarity by the Gemological Institute of America. The diamond is named after the Mauryan emperor Ashoka the Great (304–232 BCE), under whose reign the Indian subcontinent saw a remarkable consolidation of Buddhist ethics and statecraft. The stone's precise early history is difficult to document with certainty, but it is understood to have passed through several notable collections before William Goldberg acquired and recut it during the 1980s. That recutting exercise — undertaken to realise the stone's optical potential within a shape that honoured its elongated crystal habit — gave rise to the proprietary facet arrangement that Goldberg subsequently applied to other diamonds and formally trademarked.

The decision to name a cut after a single historic stone is not without precedent in the diamond trade — the Asscher cut similarly derives its identity from a family name and a specific cutting philosophy — but the Ashoka cut is unusual in that the eponymous diamond itself remains identifiable and has appeared at auction. Christie's offered the Ashoka diamond in 2016, providing one of the more prominent public valuations of the stone and reinforcing the cut's association with the highest tier of the market.

Geometry and Facet Architecture

The Ashoka cut's outline is best described as a narrow cushion: longer than it is wide, with a length-to-width ratio typically in the range of approximately 1.6:1 to 1.7:1, though the precise proportions of any given stone are subject to the cutter's judgement and the requirements of the rough. The corners are rounded rather than clipped at a sharp angle, which distinguishes the silhouette from a standard rectangular cushion and gives the finished stone a softer, almost pillow-like presence when viewed from above.

The 62-facet arrangement is a modification of the standard brilliant pattern, redistributing facets across the crown and pavilion to account for the elongated geometry. In a standard round brilliant, the symmetry of the circular outline allows a relatively straightforward radial facet layout; an elongated outline requires compensation to avoid the optical dead zones — areas of low reflectivity — that can appear at the ends of poorly engineered elongated cuts. The Ashoka cut's facet plan addresses this by adjusting the angles and proportions of the pavilion mains and the crown break facets to redirect light back through the table across the full length of the stone. The result, in well-executed examples, is a face-up appearance with a lively, dispersed brilliance rather than the windowing or extinction that can afflict elongated cushions cut to less exacting standards.

Because the cut is proprietary, William Goldberg controls the specification and licenses its production. Stones marketed as Ashoka cuts are accompanied by documentation confirming their provenance within the Goldberg programme, and the cut is not replicated by other manufacturers under that name. This is a meaningful distinction in a market where generic cushion-modified brilliants are produced in enormous quantity and variable quality.

Relationship to the Cushion Modified Brilliant

Within gemmological classification, the Ashoka cut falls under the broader heading of cushion-modified brilliant — a category that the GIA uses on grading reports to describe cushion-shaped stones whose facet arrangement departs from the cushion brilliant pattern, typically by incorporating an extra row of facets on the pavilion. This classification is accurate but incomplete as a description of the Ashoka cut, in the same way that calling a Rolls-Royce a motor car is technically correct but contextually insufficient.

Generic cushion-modified brilliants vary enormously in their length-to-width ratios, corner radii, facet counts, and optical performance. The Ashoka cut's value proposition rests precisely on the consistency and intentionality of its specification relative to that wider, heterogeneous category. Buyers and dealers who understand the distinction treat the Ashoka cut as a named variety with its own market identity, comparable in that respect to the Hearts and Arrows round brilliant or the Asscher cut, rather than as a generic shape description.

Rough Suitability and Yield Considerations

One of the stated design objectives of the Ashoka cut is efficient use of rough. Elongated diamond crystals — whether macles, flattened octahedra, or irregular shapes — can present significant yield challenges when forced into round or square outlines, because the corners of the rough must be sacrificed. An elongated cushion outline follows the natural geometry of certain rough shapes more closely, allowing a cutter to retain more of the original crystal weight while still producing a well-proportioned finished stone.

This is not a trivial consideration at the high end of the market. In large, high-colour, high-clarity diamonds — the category in which the Ashoka cut is most commonly applied — every fraction of a carat retained represents substantial value. The cut's architecture thus serves both an aesthetic and an economic function, which is part of the reason it was developed in the context of a significant historic stone rather than as a purely theoretical exercise in facet design.

Market Context and Collectability

The Ashoka cut is positioned firmly at the upper end of the diamond market. William Goldberg is a house known for large, high-quality stones, and the cut is not produced in the volumes associated with standard round brilliants or generic cushions. This relative scarcity, combined with the documented history of the namesake diamond and the controlled quality of the specification, gives Ashoka-cut diamonds a collectability that extends beyond their carat weight and grading report alone.

At auction, Ashoka-cut diamonds have appeared in the offerings of the major international houses, and the cut is recognised by specialist buyers as a distinct category. In the private retail market, it is associated with bespoke and high-jewellery contexts rather than volume bridal sales, though its elongated silhouette — which can make a stone appear larger than its carat weight might suggest — has attracted interest from buyers who prioritise visual presence alongside optical performance.

The cut is also notable for its suitability in coloured diamonds, where the elongated outline and refined facet arrangement can display the body colour of a fancy-colour stone to considerable advantage. Several notable fancy-colour examples have appeared in the trade, though the cut's primary association remains with colourless and near-colourless diamonds of exceptional quality.

Further Reading

• GIA Gems & Gemology — Ashoka Diamond at Christie's (2018)
• GIA Gem Encyclopedia — Diamond