Dutch Marquise Diamonds Wholesale Guide

A Dutch Marquise — also called a Brilliant Hexagon — is an antique elongated cut with a six-sided outline, pointed ends, and straight, angled sides, brilliant-faceted rather than step-faceted for maximum fire. Guru Diam stocks Dutch Marquise as IGI-certified lab-grown loose diamonds, cut in-house and shipped from New York, with 164 pieces currently on hand across the size and color range.

If you’ve searched “Dutch Marquise” recently, you’ve probably landed on a competitor’s product listing and nothing else — no sourcing guide, no comparison, no real explanation of what makes the cut different from a standard marquise. That gap exists because almost nobody stocks this shape in depth, and the two or three dealers who do treat it as a single SKU, not a category worth explaining. This guide fixes that, and gives you a real, in-stock wholesale source at the end of it.

What is a Dutch Marquise cut diamond?

The Dutch Marquise is an elongated hexagonal diamond: six sides, two pointed ends (like a marquise), but with the long edges broken into two angled facets per side instead of one continuous curve. That extra break in the outline is what separates it from both a standard marquise (smooth, boat-shaped) and a plain hexagon (flat-sided, no points). Because the faceting is brilliant-cut rather than step-cut, a Dutch Marquise throws noticeably more fire and scintillation than a step-cut hexagon of the same size — which is exactly why it’s also sold under the name Brilliant Hexagon. Same stone, two names, and buyers search for both.

The shape has genuine antique pedigree — it shows up in Art Deco and Edwardian-era jewelry, prized for the way its pointed silhouette elongates the finger while the brilliant faceting keeps it lively rather than flat. It fell out of common production for decades simply because cutting a clean, symmetrical hexagon with true brilliant faceting by hand is difficult and slow. That’s the same story as Old Mine and Old European cuts: a genuinely good antique shape that the modern trade mostly stopped stocking, not because demand disappeared, but because supply did.

Dutch Marquise vs. standard Marquise vs. plain Hexagon

Why lab-grown made Dutch Marquise sourceable again

The same economics that reopened Old Mine and Old European cuts for the trade apply here, only more so — Dutch Marquise was never common even on the antique/estate market, so natural supply was always closer to nonexistent than merely scarce. Lab-grown changes that math completely: because CVD-grown rough is cut to spec rather than salvaged from what an estate parcel happens to contain, a cutter can produce a true Dutch Marquise — correct outline, correct facet break, correct L:W ratio — on demand, in a target size and color, instead of you waiting years for the right antique stone to surface.

That matters most for two buyer situations. First, matched pairs: if a client wants Dutch Marquise studs or side stones, sourcing two natural antique stones that match in size and color is close to impossible; two lab-grown stones cut to the same spec is a normal order. Second, repeatability: if a Dutch Marquise engagement ring sells well, you can reorder the same shape and size, something the estate market simply cannot promise.

Certification and what to check

Guru Diam’s Dutch Marquise inventory is IGI-certified, CVD-grown. Because the shape has a non-standard outline, confirm three things before you commit to a stone, the same discipline that applies to any fancy or antique cut:

• Length-to-width ratio. Dutch Marquise typically runs 1.60–1.70 L:W. Ask for the exact measurements, not just the shape name — labeling drifts between dealers.
• Facet symmetry at the points. The two pointed ends are the most failure-prone part of the cut; check for chipping risk and symmetry under magnification before setting.
• Same-lab comparisons. As with any lab-grown purchase, compare color/clarity grades from the same certifying lab — IGI and GIA are not directly interchangeable grade-for-grade.

Sourcing Dutch Marquise wholesale: what’s actually available in the US market

Realistically, three kinds of sources exist. Gated B2B portals at a handful of Diamond District dealers who list Dutch Marquise as one SKU among thousands, with no real explanation of the cut, no comparison content, and pricing behind a login. Retail-facing sellers who carry it as a novelty item at consumer markup. And made-to-order cutting, where you spec the size and color and the stone is cut fresh — this is generally the best option when you need a matched pair, a specific size, or reliable reorder capability.

Guru Diam runs the third model with live on-hand stock layered on top: 164 Dutch Marquise pieces in inventory right now across the color and clarity range, plus made-to-order cutting for anything outside current stock, from our New York Diamond District desk. Because cutting happens in-house rather than being brokered from a third party, matched pairs and custom sizing are a standard request, not a special one.

How fast can I get a Dutch Marquise stone or a finished piece?

In-stock pieces ship same-day from New York. For a size or color not currently on hand, made-to-order cutting plus custom jewelry (CAD to finished piece) runs 4–6 days — see our custom jewelry turnaround guide for the full mechanics. That timeline is what makes Dutch Marquise a viable everyday counter offer instead of a special-order gamble you hesitate to promise a client.

Source Dutch Marquise trade-priced, in stock now

Whether you need a single stone, a matched pair for studs, or a made-to-order size for a custom engagement ring, Guru Diam carries Dutch Marquise (Brilliant Hexagon) as IGI-certified lab-grown loose inventory from our New York and Los Angeles desks, with real-time online inventory and API/CSV feed access for trade accounts.

Ready to buy? Open a verified wholesale account at /signup and book time with a gemologist at /book-appointment.

Frequently Asked Questions

What is a Dutch Marquise diamond? A Dutch Marquise is an antique elongated hexagonal diamond cut with pointed ends and brilliant (not step) faceting, also sold under the name Brilliant Hexagon. It differs from a standard marquise by its faceted (not curved) long edges, and from a plain hexagon by its pointed rather than flat ends.

Is Dutch Marquise the same as Brilliant Hexagon? Yes. Dutch Marquise and Brilliant Hexagon refer to the same cut — an elongated, pointed hexagonal outline with brilliant faceting. Both names are used in the trade; buyers search for both, so treat them as interchangeable when sourcing.

Can I get Dutch Marquise diamonds as lab-grown, and are they certified? Yes. Guru Diam’s Dutch Marquise inventory is CVD-grown and IGI-certified. Lab-grown production makes this historically rare antique cut sourceable on demand — in a target size, color, and clarity — rather than dependent on finding a natural antique stone on the estate market.

Can I order a matched pair of Dutch Marquise diamonds? Yes. Matched pairs are a standard request for this shape since cutting is done in-house to spec, rather than brokered. This is one of the main reasons lab-grown reopened the category — matching two natural antique stones for studs or side stones is close to impossible; two lab-grown stones cut to the same spec is a normal order.

How is Dutch Marquise priced compared to a standard marquise? Dutch Marquise carries a premium over a standard marquise of the same size and grade because of cutting difficulty and rarity — very few wholesalers stock it, and much of the market is made-to-order rather than off-the-shelf. Lab-grown production keeps that premium predictable rather than scarcity-driven, since pricing tracks spec and size rather than how rare a natural example happens to be.

How fast can I get a Dutch Marquise stone or a finished custom piece? In-stock pieces ship same-day from New York. Made-to-order cutting plus a finished custom piece (CAD to jewelry) runs 4–6 days from our New York and Los Angeles desks.