A marquise cut is a long, narrow shape with pointed ends, said to have been commissioned to resemble the smile of a French noblewoman. It has come back into real fashion over the past several years, prized for one specific advantage no other cut matches as well.
Marquise Diamond Size Chart: MM to Carat
| Carat Weight | Approximate MM Size (Length x Width) |
|---|---|
| 0.50 ct | 9.0mm x 4.5mm |
| 0.75 ct | 10.3mm x 5.2mm |
| 1.00 ct | 11.2mm x 5.6mm |
| 1.50 ct | 12.8mm x 6.4mm |
| 2.00 ct | 14.0mm x 7.0mm |
Figures assume a standard length to width ratio near 2 to 1. An IGI certificate confirms a specific stone's actual measurements.
The Biggest Looking Carat for Carat Diamond Shape
Because a marquise spreads its surface area across an elongated outline, it consistently reads as the largest looking shape for a given carat weight, larger even than an oval or pear. For buyers focused on visual size within a set budget, it is the most efficient cut available.
Watch for the Bow Tie Effect
Like ovals and pears, marquise cuts can show a bow tie shadow across the centre. A well cut stone minimises this to a soft shading rather than a dark, distracting band, and it is worth checking under real light before buying.
Best Settings for a Marquise Diamond
A five prong setting, with points protected at both tips, is the standard secure choice for a shape whose narrow ends are its most vulnerable point. An east west setting, with the stone oriented sideways across the finger, is a distinctive modern alternative to the traditional lengthwise placement.
Explore Marquise Cut Pieces
Browse Nivara's marquise cut lab grown diamond rings, all IGI certified.
