Is the Dutch Marquise a Real Diamond Cut? The Honest Answer
Is the Dutch Marquise a Real Diamond Cut?
Yes. The Dutch Marquise is a real diamond cut: an elongated hexagonal cut with straight, angled sides that taper to a pointed end at each tip. The stone is a real diamond, the geometry is real and measurable, and grading laboratories certify it. What "Dutch Marquise" is not is an officially recognized gemological shape: it is a trade name, so a grading report describes the geometry (one real IGI report reads "Hexagonal Modified Brilliant") rather than printing the name.
That distinction, real cut but trade name, is the entire answer, and it confuses enough buyers that it deserves a full explanation. Here is what "real" actually means for a diamond cut, what the report will say, what we know and do not know about where the name came from, and how to confirm any Dutch Marquise for yourself.
What "a real cut" actually means
Here is the fact that unlocks the whole question: there is no official registry of diamond cuts. No laboratory or standards body maintains a list of approved shapes that a cut must join before it counts as real. GIA and IGI grade stones; they do not license names. Even the familiar names sit on a spectrum. "Round brilliant" describes a tightly standardized geometry. "Cushion" covers a wide family of outlines and faceting styles that vary from maker to maker. And past the classics sits a long tradition of named cuts (the Asscher, the radiant, the princess) that all began life as somebody's trade name before common use made them feel official.
So "is it a real cut" cannot mean "is it on the official list," because no such list exists. What it can honestly mean is this: is the geometry specific and repeatable, is it actually cut into real diamonds, and will a grading laboratory certify the stone? For the Dutch Marquise the answer to all three is yes.
The three questions inside this one
When someone asks whether the Dutch Marquise is real, they are usually asking one of three different things. All three deserve a straight answer.
Is the diamond real? Yes. A Dutch Marquise is a shape, not a material. The ones we sell are Lab Grown Diamonds: real diamonds, identical in material and hardness to mined diamonds, graded by the same independent laboratories.
Is the cut real? Yes. It is a specific, measurable geometry: an elongated hexagon whose straight, angled sides meet at a vertex at the widest point and taper to a pointed end at each tip. If the sides curve, you are looking at a marquise. The full geometry is in our guide to what a Dutch Marquise diamond is.
Is the name official? No, and no one should tell you otherwise. "Dutch Marquise" is a trade name, the same way most specialty cut names are. No grading laboratory defines it, and there is no single agreed definition published by GIA, IGI, or any standards body. The name lives in the marketing; the geometry lives on the report.
A trade name is not a red flag. It is simply a label, and labels deserve verification rather than suspicion. The habit that serves you well is checking what sits behind any cut name, ours included.
What the grading report says instead
Because laboratories certify measurable geometry rather than marketing names, you will not find the words "Dutch Marquise" on a GIA, IGI, or GCAL report. You will find a description of the shape. On one real IGI report for a Dutch Marquise we sell, the shape line reads "Hexagonal Modified Brilliant" (IGI report, 2026). That phrasing is the strongest evidence in this whole discussion: an independent laboratory measured the stone and certified an elongated hexagonal brilliant. The cut is real enough to grade; it just carries a lab description instead of a trade name.
On the report you will see measurable proportions instead, including the length-to-width ratio, which for a Dutch Marquise typically runs in the 1.5 to 2.0 range (our hero proportion sits near 1.84). To see how those proportions translate to size on the hand, the Dutch Marquise size chart maps carat weight to face-up millimeters.
A different laboratory, or a differently faceted stone, may word the shape line differently, which is exactly why the report matters more than the name. If you want to get comfortable reading one, our walkthrough of how to read a diamond grading report covers every line.
The history question, answered honestly
Search this cut for long enough and you will run into origin stories: that it emerged in eighteenth-century France, that Dutch or Belgian cutters reinterpreted an older shape, that it descends from an antique "Rupee cut." We have looked for documentation behind those accounts and have not found any, so we do not repeat them. What we can verify is modest and recent: the name has circulated as a loose merchant label for elongated hexagonal stones for several years, with listings using it at least as far back as 2022, and no single agreed definition anywhere.
To be equally plain about our own role: Stienhardt did not invent, name, standardize, or popularize the Dutch Marquise. We publish a clear, citable definition of the shape, it is our signature cut, and we set and finish every ring in NYC. Other makers use the term and are welcome to. A cut does not need a romantic backstory to be real. It needs a specific geometry and a grading report, and this one has both.
How to confirm one for yourself
Since the name is a trade name, confirmation takes about two minutes and the stone's paperwork. This is the same advice we give about our own stones.
Find the report and confirm it. Type the report number into the issuing laboratory's own website and check that the details match the stone. For a Lab Grown Diamond, IGI and GCAL still issue full 4C-style reports, while GIA has graded Lab Grown Diamonds on Premium and Standard descriptive tiers since October 1, 2025 (Source: GIA, 2025-10-01).
Read the shape line. Expect geometry, not the trade name: "Hexagonal Modified Brilliant" or similar wording. That is confirmation, not a discrepancy.
Check the outline against the definition. Straight, angled sides meeting at a vertex; a pointed end at each tip; a silhouette that reads as an elongated hexagon, not a smooth boat-shaped navette.
Look at the stone itself. Most fancy shapes carry no overall cut grade from the labs, so the name alone does not guarantee the look. Judge the actual stone and its proportions in person or on video.
The rule in one line, the same one we apply to ourselves: a name is marketing, the report is fact.
Where Stienhardt stands
The Dutch Marquise is our signature cut, so we have an interest here, and the honest way to handle an interest is to disclose it and then hold ourselves to the same standard we describe. Stienhardt is a New York City jeweler that sources Lab Grown Diamonds and hand-sets and finishes them in NYC, selling direct. Every Dutch Marquise we sell comes with its independent grading report, and we would rather you read that report than take the name on faith. The cut is real. The diamond is real. The paperwork proves both.
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FAQ's
Yes. It is a real, measurable geometry (an elongated hexagonal cut with straight, angled sides and pointed ends) cut into real diamonds and certified by independent grading laboratories. "Dutch Marquise" itself is a trade name rather than an officially recognized gemological shape, so a report describes the geometry instead of printing the name.
Yes. Dutch Marquise describes the shape, not the material. The ones Stienhardt sells are Lab Grown Diamonds: real diamonds, identical in material and hardness to mined diamonds, graded by the same independent laboratories and laser-inscribed on the girdle.
Grading laboratories certify measurable geometry, not marketing names, and that is true of most specialty cut names. One real IGI report for a Dutch Marquise lists the shape as "Hexagonal Modified Brilliant" (IGI report, 2026). Seeing geometry on the shape line is confirmation the cut is real, not a discrepancy.
No one can credibly say. Origin stories circulate online (eighteenth-century France, an antique "Rupee cut"), but we have found no documentation behind them, so we do not repeat them. What is verifiable is that the name has circulated as a merchant label for elongated hexagonal stones for several years, with listings at least as far back as 2022. Stienhardt did not invent, name, standardize, or popularize the cut; we publish a clear definition and sell it as our signature cut.
No. Both are elongated with a pointed end at each tip, but a marquise has smooth, continuously curved sides (a navette, or boat shape), while a Dutch Marquise has straight, angled sides that meet at a vertex, so its outline reads as an elongated hexagon.
Confirm the grading report number on the issuing laboratory's own website, then read the shape line and measurements. For a Lab Grown Diamond, IGI and GCAL still issue full 4C-style reports, while GIA has graded Lab Grown Diamonds on Premium and Standard descriptive tiers since October 1, 2025 (Source: GIA, 2025-10-01). Check the outline: straight angled sides, pointed ends, an elongated hexagonal silhouette. A name is marketing; the report is fact.