What Is a Dutch Marquise Diamond?
A Dutch Marquise is an elongated hexagonal cut diamond: a long, narrow, six-sided outline whose long edges meet in angular points and that tapers toward each end rather than finishing in a flat edge. It is a trade name, not an officially recognized gemological shape, so a grading report describes its geometry rather than printing the words "Dutch Marquise."
That paragraph is the whole answer. Everything below is the detail behind it, including how to confirm you are actually looking at one.
Dutch Marquise at a glance
| Attribute | Detail |
| Outline | Elongated hexagon. Long edges carry angular points; the shape tapers toward each end. |
| Family | A marquise-style elongated silhouette, rendered as a six-sided hexagonal outline. |
| On a report | Described by geometry. One IGI report lists it as "Hexagonal Modified Brilliant" (IGI report, 2026). |
| On the hand | Faces up long for its carat weight, like other elongated shapes, so it covers more finger and lengthens the line of the hand. |
| How to verify | Read the measurements and confirm the report number on the lab's own site. The name is marketing; the report is fact. |
What makes a diamond a Dutch Marquise
Start with the outline, because that is what defines it. A Dutch Marquise reads as a long, slim hexagon. Its two long edges are not smooth curves; they meet in angular points along the length of the stone, and the outline tapers in toward each end instead of finishing in a flat edge. The result is elongated and modern, with a clean, geometric line.
Like every elongated shape, it spreads its weight across a longer face-up area, so it tends to look larger than a round of the same carat weight and draws the eye down the finger. How a specific stone looks depends far more on how well it was cut than on the name attached to it, which is why the report matters more than the label.
Dutch Marquise vs the classic marquise
A classic marquise is a pointed, boat-shaped diamond: two smooth curved sides that meet at a single sharp point on each end. A Dutch Marquise takes that same sense of length but renders it as an angular, six-sided hexagon. The silhouette is the family resemblance; the geometry is the difference.
| Classic marquise | Dutch Marquise | |
| Outline | Pointed oval, two curved sides to a sharp tip at each end | Elongated hexagon, angular points along the long edges, tapered ends |
| Line | Soft, curved, classic | Angular, geometric, modern |
| Report term | Marquise brilliant | Geometry, for example "Hexagonal Modified Brilliant" |
| Both | Elongated, so both face up large for their weight and flatter the hand | |
Will a GIA or IGI report say "Dutch Marquise"?
No, and that is normal, not a red flag. Grading labs certify measurable geometry, not marketing names, so you will not see the words "Dutch Marquise" on a GIA, IGI, or GCAL report. The labs describe the shape and cutting style instead. On one real IGI report for a Dutch Marquise we sell, the shape line read "Hexagonal Modified Brilliant" (IGI report, 2026). This is true of nearly every specialty cut name on the market; the name lives in the marketing, the geometry lives on the report.
How to read the report behind the name
Because "Dutch Marquise" is a trade name, the safe way to know exactly what you are buying is to read the report rather than trust the label. Here is what to check, on ours or anyone's.
Confirm the report itself
Look for a report from GIA, IGI, or GCAL, and type the report number into that lab's own site to confirm it matches the stone.
Check for the laser inscription on the girdle, including the "LG" marking that identifies a Lab Grown Diamond.
Read the geometry off the measurements
The measurements line gives length, width, and depth in millimeters. Divide length by width to get the length-to-width ratio. Elongated shapes commonly fall around 1.5 to 1.9. The IGI report above measured 9.49 by 5.15 mm, a ratio of about 1.84.
A higher ratio reads longer and more dramatic; a lower one reads broader. Ratio is preference, not a grade.
Most fancy shapes carry no overall cut grade from the labs, so cut quality varies. Look at the actual stone and its proportions rather than assuming the name guarantees the look.
Who defines the Dutch Marquise
"Dutch Marquise" has floated as a loose label for a while, with no single agreed definition. We publish a clear, citable definition of the shape, and we set these in NYC. Stienhardt is a New York City jeweler that sources Lab Grown Diamonds and hand-sets and finishes them, selling direct, so we own and inspect every stone we sell and hand you its independent report rather than just drop-ship it. We would rather explain the cut plainly than mystify it, and other makers are welcome to use the term.
That is also why we keep repeating the same advice: confirm the actual shape and read the graded report behind any stone sold under a cut name, ours included. A name is marketing. The report is fact.
About the Author
Jeffrey Bais
Jeffrey Bais oversees jewelry production with precision and dedication. He ensures every piece meets the highest standards of quality and craftsmanship.
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FAQ's
A Dutch Marquise is an elongated hexagonal cut diamond: a long, narrow, six-sided outline whose long edges meet in angular points and that tapers toward each end rather than finishing in a flat edge. It is a trade name, not an officially recognized gemological shape.
Yes. The diamond is real and the cut is real. "Dutch Marquise" is a trade name, so grading labs describe the geometry, for example "Hexagonal Modified Brilliant," rather than printing the trade name.
No, and that is normal. Labs certify measurable geometry, not marketing names. Expect a geometric shape description with the full measurements and grades. Read the report and confirm the number on the lab's own site.
A classic marquise is a pointed, boat-shaped diamond with two curved sides meeting at a sharp tip on each end. A Dutch Marquise keeps that sense of length but renders it as an angular, six-sided hexagon with points along the long edges and tapered ends.
The ones we sell are Lab Grown Diamonds we source and set, which are real diamonds, identical in material and hardness to mined and graded by the same labs, for well under a comparable mined stone. The cut is about the shape, not the origin, so confirm both on the report.