What "Fancy Cut" Means
Any diamond shape other than round brilliant is considered a "fancy cut" — that includes princess, cushion, oval, emerald, radiant, pear, marquise, asscher, and heart shapes.
Why Fancy Cuts Often Look Bigger
Elongated shapes — oval, marquise, pear, and radiant — spread their weight across length and width rather than depth, which means they typically appear 10–25% larger face-up than a round diamond of the same carat weight. Marquise tends to show the most dramatic spread of any shape, with pear and oval close behind — a real consideration if maximizing apparent size on a set budget is a priority.
The Bow-Tie Effect
Certain elongated brilliant shapes — oval, marquise, pear, heart, and sometimes radiant — can show a dark shadow across the center of the stone. The cause is more specific than "something blocking the light": it comes down to the exact arrangement of the stone's pavilion facets. Recent GIA research on oval cuts found that certain pavilion facets crossing the widest part of the stone (called "belly" facets) produce a noticeably more pronounced bow-tie — which is why, by 2023, nearly 90% of ovals submitted to GIA for grading were being cut without them specifically to minimize the effect. A well-cut stone can show very little bow-tie at all, but intensity still varies stone to stone even within the same shape, so it's worth viewing photos or video of the actual stone before committing.
Fancy Cuts Cost Less Per Carat Than Round — Here's Why
Rough diamond crystals commonly form as octahedrons, a shape that lends itself naturally to certain cuts far more than others. A princess cut, for instance, can retain roughly 80% of a rough stone's original weight, since its square shape closely follows the octahedron's natural geometry, while a round brilliant typically retains only around 40%, since so much of the rough has to be cut away to achieve its curved outline. That yield gap is the biggest single reason fancy shapes are typically priced lower per carat than a round diamond of comparable quality — it isn't just about demand. (Precise yield figures for shapes like marquise and pear are less consistently documented than round and princess, since their narrower points mean the exact number depends heavily on the individual rough stone, but the same general principle holds: the closer a shape follows the rough's natural form, the less is wasted in cutting.)
Choosing Among the Fancy Cuts
- Most brilliance outside of round: Radiant or Cushion.
- Elongation and a finger-slimming effect: Oval, Marquise, or Pear.
- A vintage, architectural look: Emerald or Asscher, for their step-cut flash rather than brilliant sparkle.
- A romantic statement shape: Heart or Pear.