Polki Diamond — The Stone Itself, Distinct from the Setting Technique
Polki Diamond — The Stone Itself, Distinct from the Setting Technique
Uncut or table-polished diamond used in Indian foil-backed adornment
A polki diamond is the stone used in the polki tradition: a natural diamond crystal worked only minimally — with a flat table polished onto an octahedral or irregular face, or with one or two flat surfaces ground to admit light — and set foil-backed in the kundan or jadau techniques characteristic of Indian jewellery. The term is sometimes used interchangeably with polki in the broader sense, but is more precise in distinguishing the stone from the setting technique that surrounds it.
Distinction from rose cut and modern brilliant
The polki diamond sits at one end of a continuum of historical diamond cuts. At the lightly worked end, a polki diamond may have only a single window polished into the natural crystal face. At the more worked end, a polki diamond approaches the rose cut, with multiple triangular facets converging on a central crown apex, but without the table that defines table-cut and brilliant traditions. The boundary between the most heavily worked polki and the lightest rose cuts is a matter of trade convention rather than mineralogical distinction.
Modern brilliants are not polki, even when set in Indian-style foil-backed mounts. The defining feature of polki is the retention of the natural crystal habit, which requires the cutter to work with rather than against the original octahedral or irregular form.
Sources and material
Historically, polki diamonds came from the Golconda mines of southern India and from later sources in Borneo and Brazil. Contemporary polki diamonds are sourced from the global rough market, with stones selected at the rough stage for crystal forms that lend themselves to flat-table polishing. African and Russian rough now supplies most of the polki cutting industry, with the work concentrated in Jaipur and surrounding centres in Rajasthan.
Quality assessment
Polki diamonds are graded for transparency, colour, and crystal integrity rather than for the standard four Cs of brilliant grading. The most important factors are the size and regularity of the crystal, the freedom from heavy fracturing, and the colour grade — near-colourless polki diamonds command a substantial premium over those with visible yellow or brown tint. Inclusions are tolerated more in polki than in modern brilliants, both because the foil-back masks them and because the aesthetic of the polki tradition accepts and even values a degree of natural character in the stone.
Cultural significance
The polki diamond carries deep cultural weight in Indian wedding and ceremonial jewellery. Heirloom polki pieces are passed through generations and frequently form part of a family's most important jewellery holdings. The tradition is closely tied to Mughal-era court jewellery and to the regional traditions of Rajasthan, Hyderabad, and the Punjab.
In the trade
Polki diamonds are bought and sold within a specialist market that overlaps but is distinct from the modern brilliant trade. Pricing reflects polki's own grading criteria and is influenced by the size and integrity of individual stones, the period attribution of the piece if any, and the quality of the setting work. Western retailers and auction houses have increased their attention to polki in the past two decades as interest in non-Western design traditions has grown.