Specialty & Antique Cut Lab Grown Diamonds
Portuguese, Rose, Old European, Old Mine, and French cuts — precision-cut in-house at our Surat facility.
Antique Cut Introduction
Most lab-grown diamond suppliers focus entirely on modern brilliant cuts, optimized for maximum sparkle and cutting efficiency. Specialty and antique cuts are a different discipline — cuts developed decades or centuries before modern faceting mathematics existed, valued for character and historical accuracy rather than pure light performance. Reproducing them accurately, especially at scale in lab-grown material, requires cutting expertise most volume-focused manufacturers don’t maintain.
Since 2018, OCS Diamond has offered these cuts direct from our Surat facility, as GJEPC and Surat Diamond Bourse members. This is a genuine extension of our manufacturing capability, not a side offering — every specialty and antique cut we produce carries the same IGI certification and internal quality review as our standard inventory.
Portuguese Cut
The Portuguese cut is defined by an extraordinary facet count — typically 161 facets or more, compared to the 57-58 facets of a standard round brilliant. Extra rows of triangular and kite-shaped facets extend across the crown and pavilion, creating a layered, kaleidoscope-like sparkle rather than the large single flashes of a modern brilliant cut. The cut’s exact origins are debated — most accounts trace it to Portuguese gem-cutting traditions, connected to the historic diamond trade between Brazil and Portugal — but the defining feature isn’t in question: a deep pavilion and elevated crown built specifically to maximize light performance in low, ambient lighting.
Because of the facet density, the Portuguese cut performs best in larger stones — generally 2 carats and above — where there’s enough surface area for the intricate faceting to read clearly rather than looking cluttered at smaller sizes. This is a genuine consideration for buyers: a small Portuguese cut stone won’t showcase the cut’s signature effect the way a larger one will.
Rose Cut
The Rose Cut is one of the oldest diamond cutting styles still in use, dating to the 16th-18th centuries. It has a flat base and a domed top covered in triangular facets — inspired by the spiraling petals of a rosebud — with no pavilion at all, which fundamentally changes how it handles light compared to every other cut on this page. Without a pavilion to bounce light back up through the crown, a Rose Cut produces a softer, more diffused glow rather than sharp brilliant-cut flashes — historically well suited to candlelit settings, which is exactly the lighting condition it was designed for.
Facet count varies more in Rose Cuts than any other cut we offer — anywhere from 3 to 24 facets depending on stone size and design intent, with no single “correct” count the way a modern brilliant cut has a standard facet arrangement. The flat profile also makes Rose Cuts well suited to bezel settings and pieces worn close to fabric, a practical reason for their historical popularity beyond aesthetics alone.
Old European Cut
The Old European Cut emerged in the late 19th century and was the dominant diamond cut through the Victorian and Edwardian eras, before the modern round brilliant cut’s mathematically optimized proportions took over in the 20th century. It’s the direct precursor to today’s round brilliant — a small table, high crown, and a distinctly large, flat culet (visible as a small facet at the very bottom of the stone, where modern cuts come to a point instead). This combination produces a distinctive antique sparkle pattern: warmer, more scattered light than a modern brilliant’s precise white flashes.
Old European Cuts are frequently requested for period-accurate restoration and reproduction jewelry, where getting the facet proportions right — not just approximating “an old-looking round stone” — genuinely matters to the buyer.
Old Mine Cut
The Old Mine Cut predates the Old European Cut, tracing to the 18th century, and is commonly confused with it — worth clarifying clearly, since the two are genuinely different. Where Old European Cuts are round, Old Mine Cuts are square or rectangular with rounded corners, closer in outline to a modern cushion cut. This shape comes directly from the era’s cutting priority: retaining as much weight as possible from the rough diamond’s natural octahedral form, rather than cutting away material for a rounder shape. The result is a high crown, deep pavilion, and a large, flat culet — even more pronounced than in an Old European Cut — along with the slightly uneven symmetry typical of hand-faceting before modern cutting technology existed.
That hand-cut asymmetry isn’t a flaw in this context — it’s part of the cut’s authentic character, and buyers specifically requesting Old Mine Cuts for restoration work generally want that period-accurate imperfection preserved, not cut away.
French Cut
The French Cut is a square or rectangular cut, based directly on the diamond’s natural octahedral rough shape, with a distinctive rhombus-shaped table set diagonally across the crown. It carries far fewer facets than the cuts above — a fraction of a modern brilliant’s facet count — which historically made it a practical, efficient cut rather than a showcase piece. This is reflected in how it’s traditionally used: as an accent stone in Art Deco-era jewelry, surrounding a larger center stone, rather than as the hero stone in a piece.
What Determines Pricing on Specialty & Antique Cuts
Pricing here follows a different logic than standard brilliant cuts. Cutting time and skill required is the dominant factor — a 161-facet Portuguese cut takes meaningfully longer to execute precisely than a standard round brilliant, and that labor is reflected in price more than carat weight alone. Rough utilization also matters: cuts like Old Mine and French, designed around retaining weight from the natural rough shape, can sometimes offer better value per carat than cuts requiring more material to be cut away. As with our other categories, tell our team your intended application — statement piece, restoration work, accent stones — and we’ll guide you to the right cut and spec combination rather than you guessing.
Available Specifications
| Specification | Details |
|---|---|
| Cuts Available | Portuguese, Rose, Old European, Old Mine, French |
| Carat Range | available on inquiry, varies by cut (Portuguese cut performs best at 2ct+; Rose and French commonly used at smaller accent sizes) |
| Growth Type | CVD & HPHT |
| Certification | IGI |
| Custom manufacturing | 10 business days |
“Every stone carries an IGI certificate. Specialty and antique cuts are internally reviewed by our in-house gemology team for faceting accuracy before listing, not just standard 4Cs grading — precision matters more in these cuts than in standard brilliants.”
Live Stock Table
Filtered to specialty/antique cuts, where in-stock; custom order path highlighted for cuts not currently available.
Why Choose Antique Cuts From OCS
Genuine Cutting Expertise
Precision faceting for these patterns requires skill most volume-focused cutters don’t maintain
Historically Accurate
We cut to authentic facet proportions, not an approximation of “antique-looking”
Verified Before You Buy
Certificate and video linked on every stone, with live video verification available before payment
Frequently Asked Questions
Shape and era. Old Mine (18th century) is square or rectangular with rounded corners; Old European (late 19th century) is round and came later, as cutting technology improved. Old European is the direct precursor to the modern round brilliant.
Yes — this is one of the most common reasons buyers request these cuts. Tell us the specific proportions or reference piece you’re matching, and our team will confirm feasibility.
Yes, on request — custom color and cut combinations follow our standard 10 business day manufacturing timeline.
With 161+ facets packed into the stone, smaller sizes don’t have enough surface area for the pattern to read clearly — the effect is most visible at 2 carats and above.
Custom antique and specialty cuts follow our standard 10 business day timeline, same as any custom order.