The Dutch Marquise: Definition, Size Chart, and Report Guide
The Dutch Marquise: Definition, Size Chart, and Report Guide
The Definition
A Dutch Marquise is an elongated hexagonal cut diamond: a long, narrow silhouette whose two long edges carry angular points and taper to sharp, pointed ends.
There is no official length-to-width range for the shape, because Dutch Marquise is a trade name rather than a standardized cut. Our certified reference stone measures 1.84 (IGI), and the ratio of any stone is on its grading report.
That is the complete definition, stated first, because this shape is explained loosely almost everywhere else. Everything below is the detail: the exact geometry, what the cut is not, how it reads on a grading report, and how big each carat weight actually looks.
The Geometry, Precisely
- Outline: an elongated hexagon. Six sides: two long, straight, angled edges per flank meeting in an angular point at each side, converging to a sharp point at each end.
- Ends: pointed. Never rounded, never softened, never cropped flat. The points are what give the shape its marquise-like silhouette.
- Length-to-width ratio: not fixed by any standard. Our certified reference stone measures 1.84 (IGI); a lower ratio reads broader, a higher one reads longer, and the number for any stone is on its grading report.
- Face-up behavior: the elongated outline spreads weight along the finger, so the shape reads large for its carat weight and visually lengthens the hand.
The elongated silhouette also affects which wedding band sits best beside it, covered in what wedding band fits a Dutch Marquise.
What It Is Not
- Not a classic marquise (navette). A marquise sweeps in two smooth curves from point to point. The Dutch Marquise trades those curves for straight, angular edges: same long silhouette, entirely different geometry up close.
- Not a plain elongated hexagon. A standard elongated hexagon ends in blunt, flat-cut edges. The Dutch Marquise tapers to true points. The ends decide it: every Dutch Marquise is an elongated hexagon, but not every elongated hexagon is a Dutch Marquise.
The Three Names One Stone Can Carry
| Layer | Name | Who uses it |
|---|---|---|
| Trade name | Dutch Marquise | Jewelers and listings. A style name, not a grading term. |
| Shape class | Elongated hexagonal cut | The literal geometric description; the definition above. |
| Grading term | Hexagonal Modified Brilliant | What an IGI report may print for this stone. |
This is normal: laboratories certify measured geometry, not marketing names. It is also your protection as a buyer. Read the shape, the measurements, and the length-to-width ratio on the IGI or GIA report and confirm they match the definition on this page. A name is marketing; the report is fact. That holds for every cut sold under a trade name, ours included.
Size Chart: mm to Carat
Estimated face-up dimensions for the Dutch Marquise across its ratio range, computed from the standard estimated-weight relationship for elongated brilliant shapes (length x width x depth x 0.00565, at 62% depth). Hexagonal outlines vary slightly by cutting; the stone's true measurements are on its report.
The complete Dutch Marquise size chart from mm to carat covers every weight in this table and beyond.
| Carat | Ratio 1.50 | Ratio 1.84 | Ratio 2.00 |
|---|---|---|---|
| 0.50 ct | 6.85 x 4.57 mm | 7.85 x 4.26 mm | 8.30 x 4.15 mm |
| 0.75 ct | 7.84 x 5.23 mm | 8.98 x 4.88 mm | 9.50 x 4.75 mm |
| 1.00 ct | 8.63 x 5.75 mm | 9.89 x 5.37 mm | 10.45 x 5.23 mm |
| 1.25 ct | 9.29 x 6.20 mm | 10.65 x 5.79 mm | 11.26 x 5.63 mm |
| 1.50 ct | 9.88 x 6.58 mm | 11.32 x 6.15 mm | 11.96 x 5.98 mm |
| 2.00 ct | 10.87 x 7.25 mm | 12.46 x 6.77 mm | 13.17 x 6.58 mm |
| 2.50 ct | 11.71 x 7.81 mm | 13.42 x 7.29 mm | 14.19 x 7.09 mm |
| 3.00 ct | 12.44 x 8.30 mm | 14.26 x 7.75 mm | 15.07 x 7.54 mm |
| 4.00 ct | 13.70 x 9.13 mm | 15.69 x 8.53 mm | 16.59 x 8.30 mm |
| 5.00 ct | 14.75 x 9.84 mm | 16.91 x 9.19 mm | 17.87 x 8.94 mm |
Interactive calculator
Convert in either direction (carat to mm, or measurements to estimated carat) at any ratio and depth:
Open the interactive Dutch Marquise size calculator.
Publishers and educators: this chart is free to embed with the credit link intact. Copy the embed code from the chart page.
Frequently Asked Questions
Is a Dutch Marquise a real diamond cut?
Yes, it is a real diamond shape sold and graded today, but it is a trade name rather than an officially recognized gemological category, so it will not appear on a grading report by that name. The shape itself is specific: an elongated hexagonal cut with angular sides and pointed ends. Confirm the measured geometry on the report.
For more on how grading labs treat trade names like this one, read is the Dutch Marquise a real cut.
What does a Dutch Marquise look like on a grading report?
The laboratory describes the measured geometry, so on an IGI report the stone may read "Hexagonal Modified Brilliant" with the exact measurements and length-to-width ratio. That is normal and expected for any trade-named cut.
Is a Dutch Marquise the same as a marquise?
No. They share the long, pointed silhouette, but a classic marquise has smooth, curved sides (a navette) while the Dutch Marquise has straight, angular sides with points along the long edges. They are different geometries.
How big does a 2 carat Dutch Marquise look?
At a length-to-width ratio near 1.84 (our hero stone) and 62% depth, an estimated 12.46 x 6.77 mm face up. Elongated shapes spread their weight, so a Dutch Marquise reads larger than a round brilliant of the same carat weight. The exact dimensions for any real stone are on its report.
Who makes the Dutch Marquise?
Several sellers list stones under this trade name. Stienhardt controls its Dutch Marquise cut through a special factory relationship, hand-sets and finishes each ring in New York City, sells the stone and setting together direct to consumer, and publishes this definition. Every stone ships with its independent grading report.
Because the name is a trade name and not a graded category, the report is what tells you exactly what you are getting: an IGI report lists the geometry as a Hexagonal Modified Brilliant, and you can confirm any stone's report number on the issuing lab's own site. For the full breakdown, see our complete guide to what a Dutch Marquise diamond is.