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Loose Marquise Diamond Shape: What to Look For.
The Marquise Brilliant takes its name from a legend that the Sun King desired a stone to be polished into the shape of the mouth of the Marquise of Pompadour.
The Marquise Brilliant is a boatshaped modified brilliant. It is generally agreed that a length-to-width ratio between 1.75:1 and 2:1 is most pleasing. As with other fancy shapes, a certain degree of what constitutes a beautiful shape has to do with the consumer's individual taste. The ultimate shape of the finished diamond is determined by the rough and what parameters it allows. The typical Marquise Brilliant contains 56 facets.
Of concern to consumers when evaluating a marquise shape diamond is the appearance of a visual pattern called a "bow-tie" which looks exactly like that, right in the center of the diamond. It is true that an extreme bow-tie can be jarring and unattractive to the eye, but some amount of bow-tie is beneficial to the visual appearance of the diamond as it provides contrast brilliance and makes the stone stand out in sharper detail.
Minimal bow-tie indicated by the arrows.
An example of a beautifully cut marquise diamond is shown below.
