A Guide to Diamond Shapes: How Cut Affects Brilliance, Size, and Style

Shape vs Cut: A Useful Distinction

Diamond shape refers to the outline of the stone when viewed from above — round, oval, square, rectangular, and so on. Diamond cut refers to the quality of the faceting. Shape is primarily about aesthetics. Cut quality is primarily about light performance.

Round Brilliant

The round brilliant is the most popular diamond shape for engagement rings. It is cut with 57 or 58 facets arranged to maximise light return — more brilliance and fire than any other shape. Its symmetry makes it the easiest shape to cut to a high standard.

Oval

The oval brilliant is a modified round with an elongated outline. The elongation creates a visually larger appearance per carat. On most hands, an oval also creates a lengthening effect that many wearers find flattering. Ovals are subject to the "bow-tie effect" — a dark, bow-tie-shaped area across the centre of the stone. Well-cut ovals have a minimal, subtle bow-tie.

Emerald Cut

The emerald cut is a rectangular step cut that produces a "hall of mirrors" effect — deep, reflective flashes of light and dark. It is less forgiving of inclusions and colour than brilliant cuts. For an emerald cut, VS2 or above clarity and G or above colour is generally recommended.

Other Shapes Worth Knowing

The pear combines the brilliance of a round with the elongation of an oval, tapering to a point at one end. The marquise is an elongated oval with pointed ends — dramatic and the most finger-lengthening shape available. The cushion cut has a softer, more romantic look with larger facets creating broader flashes of light.

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