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A portrait cut is a flat, extremely thin diamond slice with a broad table and almost no depth, historically set over a miniature portrait or a lock of woven hair so the image showed through the stone's transparency. Guru Diam cuts portrait diamonds to order; none are held as standing stock.
Search "portrait cut diamond" and you mostly find museum catalog entries and estate-jewelry auction listings — almost nothing from a working wholesaler, because almost no one cuts this shape anymore. This page is written for the buyers who do need it: antique jewelry restorers, custom houses recreating a hairwork or miniature piece, and anyone who's been told "we don't do that" everywhere else they've called.
What is a portrait cut diamond?
A portrait cut — sometimes called a portrait stone — isn't defined by its outline the way most cuts are; it's defined by its depth, or the near-total lack of it. The stone is cut flat and thin, with a wide, minimally faceted table and shallow sides, sacrificing brilliance and fire almost entirely for optical clarity. That trade-off was the point: in Georgian and Victorian jewelry, a portrait cut diamond was set directly over a hand-painted miniature portrait or a woven lock of hair, and its transparency let the image underneath show through essentially undistorted. A standard brilliant-cut diamond would scatter that image into unreadable light; a portrait cut leaves it intact.
The outline itself can be round, oval, or irregular, dictated by the setting — it was always secondary to the flatness. What made it a portrait cut was cutting technique, not silhouette, which is part of why buyers searching for it are usually looking for a function (transparency over an image) more than a specific shape.
Why portrait cut diamonds are cut to order, not stocked
Nobody in the modern wholesale trade holds meaningful standing stock of portrait cut diamonds, Guru Diam included, and that's worth saying plainly. Two things drive that. Demand is genuinely narrow — almost entirely antique restoration and custom sentimental jewelry, not a shape anyone buys off a shelf. And cutting one is harder than the flatness suggests: a slice that thin is far more prone to cracking under the saw and polishing wheel, and there's very little material to work with if something goes wrong mid-cut. It's a shape that only makes sense to cut against a specific order, at a specific target thickness and diameter, for a specific piece.
Lab-grown CVD production is what makes taking on that order practical at all. Because the rough is grown to be cut, not salvaged from an irregular natural crystal, a cutter can target the exact thin, wide-table geometry a portrait cut needs without fighting the rough's natural shape — the same reason lab-grown reopened other antique cuts that natural supply had effectively closed off.
Portrait cut vs. rose cut vs. standard table cut
| Attribute | Portrait cut | Rose cut | Standard table cut |
|---|---|---|---|
| Depth | Minimal — near-flat | Flat base, domed crown | Moderate, faceted depth |
| Table | Very wide, dominant | No table (faceted dome) | Wide table, standard proportions |
| Primary goal | Transparency / see-through | Soft glow, low fire | Balanced brilliance |
| Historical use | Portrait miniatures, hairwork jewelry | Georgian/Victorian jewelry, closed-back settings | General-purpose antique faceting |
| Modern availability | Cut to order only | Occasionally stocked | Common |
Sourcing a portrait cut diamond: what to expect
Because every portrait cut is made against a specific target — diameter, thickness, and the piece it's being set into — sourcing one starts with a conversation, not a catalog lookup. Bring the setting or restoration project, the target size, and how thin the finished stone needs to be to preserve the image or hairwork underneath; Guru Diam's cutting floor in New York will assess feasibility against available rough and quote from there. Standard cut-grading doesn't really apply to a portrait cut — it isn't cut for a cut grade — so these are typically sold by spec rather than as a graded stone, though an IGI diamond type and color report can be arranged on request if the piece calls for one.
Guru Diam is trade-only, wholesale-only, with no retail markup, cutting CVD lab-grown stones from our New York Diamond District and Los Angeles locations. Contact us with your project spec through /book-appointment, or open a wholesale account at /signup to start the conversation.
FAQ
What is a portrait cut diamond?
A portrait cut is a flat, extremely thin diamond with a wide table and minimal depth or faceting, historically set over a miniature painted portrait or a lock of woven hair so the image beneath showed through the stone's transparency.
Does Guru Diam keep portrait cut diamonds in stock?
No — portrait cut diamonds are cut to order against a specific project spec (target diameter and thickness), not held as standing inventory. Contact us for current availability and to start a made-to-order request.
Can a portrait cut diamond be certified?
Standard cut grading doesn't apply to a portrait cut, since it isn't faceted for brilliance the way a graded stone is. An IGI diamond type and color report can be arranged on request; these stones are otherwise sold by spec rather than as a graded cut.
What is a portrait cut diamond used for today?
Primarily antique jewelry restoration and custom sentimental pieces — recreating or repairing hairwork rings and lockets, or building a new piece in the same historical style, where a diamond needs to sit over an image or keepsake and stay transparent.
How do I order a custom portrait cut diamond?
Bring your target diameter, thickness, and the piece or setting it's going into. Guru Diam's New York cutting floor will assess it against available rough and quote the cutting directly — contact us through /book-appointment.
