The Mughal cut is a historical Indian style of gemstone polishing characterised by large flat table facets, minimal additional faceting, and the systematic prioritisation of carat weight retention over the brilliance optimisation that would dominate later European cutting traditions. The style was used extensively across the Mughal period (approximately 1526 to 1857) for diamonds, emeralds, rubies, and sapphires, and remains the dominant cut form for many of the historic Indian gemstones held today in museum collections and royal treasuries. The Mughal cut is also referred to as the Mogul cut in some English-language sources and overlaps in some respects with the polki diamond category and the broader Indian table-cut tradition.

Form and construction

A typical Mughal-cut stone presents as a relatively shallow gem with a large polished table dominating the crown, a polished or partially faceted pavilion below, and an outline that follows the natural shape of the original rough crystal. Diamond Mughal cuts often retain identifiable fragments of the original octahedral crystal form; emerald and ruby Mughal cuts may follow the prismatic habit of the original beryl or corundum crystal. The girdle is typically irregular, conforming to the natural rough rather than being polished to a calibrated round or oval outline.

Additional faceting beyond the table is variable. Some Mughal cuts have only the table and a polished pavilion. Others include modest additional facets on the crown — eight or so principal facets surrounding the table — and matching pavilion facets. The geometry is closer to a step cut than to a brilliant cut, with the facets functioning more as polished planes than as light-returning reflectors. The result is a stone that returns light from the table principally through specular reflection rather than the internal-reflection optics of a brilliant cut.

Why the cut took the form it did

The Mughal cut reflects three converging factors. First, the Indian cutting tradition placed enormous value on carat weight retention, with the loss of weight from the original rough being seen as both an economic and a symbolic diminishment of the stone. The Mughal cut typically retains 60 to 80 per cent of the original rough weight, against 30 to 50 per cent for a modern brilliant cut on comparable rough. Second, the technological capabilities of Indian cutting workshops in the period were optimised for polishing flat planes rather than for the precise angular geometry required for brilliant-cut light return. Third, the aesthetic preferences of the Mughal court valued the visible mass of the stone and its colour over the optical brilliance that would later become the dominant criterion in European cutting.

The interaction of these three factors produced a cutting tradition that is internally coherent and well suited to its cultural context, even if it produces stones that look strikingly different from modern brilliant-cut equivalents. Many of the most important historic Indian gemstones — the great Golconda diamonds, the Mughal court emeralds and rubies — were cut in this tradition and retain their Mughal cuts today, with attempts at recutting to modern proportions historically resisted both for their loss of weight and for their effacement of the historical character of the stone.

The diamond Mughal cut

Diamond Mughal cuts are the most familiar examples of the tradition, with many of the historic Indian diamonds presenting in this form. The Koh-i-Noor diamond carried a Mughal cut at the time of its acquisition by the British Crown in 1849; the stone was subsequently recut in London under the supervision of Prince Albert into a more European brilliant form, losing approximately 40 per cent of its weight in the process. The Daria-i-Noor and the Nur al-Ain diamonds, both held in the Iranian Crown Jewels, retain their Mughal cuts and are particularly important documents of the period cutting style. The Hortensia diamond in the French Crown Jewels also retains its Mughal cut.

The emerald Mughal cut

Emerald Mughal cuts are common in the historic carved emerald tradition, with large Colombian emeralds imported into India through the Portuguese trade routes being polished into characteristic Mughal forms with carved decoration. The carved Mughal emeralds — often inscribed with verses from the Qur'an, with floral motifs, or with the names of their owners — are among the most distinctive products of the Mughal jewellery tradition and are held in major collections including the Al Thani Collection, the Khalili Collection, and the Victoria and Albert Museum.

Recutting questions

The question of whether to recut historic Mughal-cut stones to modern proportions is a recurring debate in the connoisseurship and the broader gem trade. Recutting can substantially increase the brilliance and per-carat value of a stone but at the cost of weight, historical character, and provenance documentation. The general consensus in the contemporary high-end trade is to preserve the original Mughal cut wherever possible, with recutting reserved for cases where the original cut is severely damaged or where the stone's historical significance does not depend on the cut form.

In the trade

For Skyjems and the broader trade, the Mughal cut is encountered principally in historic Indian gemstones and in contemporary pieces inspired by the Mughal tradition. Genuine period stones command substantial premiums over comparable modern cuts, with the historical character and provenance documentation supporting the valuation. Contemporary Mughal-style cuts are sometimes produced for jewellery designed in the Indian high tradition, where the cut form is part of the broader stylistic reference to the Mughal court aesthetic. The cut is one of the most distinctive products of the historical Indian lapidary tradition and an important reference point for the broader history of gemstone cutting.

Further reading

• Victoria and Albert Museum — Treasures of the Mughals
• GIA Gems & Gemology — historic diamond cutting
• International Gem Society — gemstone cutting history