Choosing a diamond shape is one of the biggest style decisions for your engagement ring. Below, we explain shape vs cut, how length-to-width ratio changes the look, and which shapes can appear larger. Then, compare shapes in person at our Sandy Springs showroom serving Metro Atlanta.

Diamond Shape vs. Diamond Cut

Shape is the outline (round, oval, cushion, pear, emerald, princess, radiant, marquise, Asscher, heart). Cut is how facets and proportions are arranged to maximize light performance (brilliance, fire, scintillation). Knowing the difference helps you balance sparkle, style, and budget.

What Length-to-Width Ratio Means

For elongated shapes (oval, pear, marquise, emerald, elongated cushion/radiant), the length-to-width (L:W) ratio controls how slender or broad a diamond looks. Higher ratios look more elongated; lower ratios look more rounded. Pick a ratio that matches your style and setting.

Which Shapes Can Look Bigger for the Carat

Shapes that maximize face-up area—often oval, marquise, and pear—can appear larger than other shapes at the same carat weight due to their elongated outlines.

Quick Guide to Popular Diamond Shapes

• Round Brilliant: Classic sparkle; strong all-around choice.
• Oval: Elongates the finger; check for balanced bow-tie.
• Cushion: Soft corners; square or elongated—ratio matters.
• Pear: Tapered elegance; symmetry and a protected tip are key.
• Emerald: Step-cut clarity; prioritize eye-clean stones and symmetry.
• Princess: Modern square; corners may show color—setting choice matters.
• Radiant: Trimmed corners + brilliant facets; square or elongated looks.
• Marquise: Maximizes spread; secure prongs at both points.
• Asscher: Square step-cut elegance; clarity and symmetry are noticeable.
• Heart: Distinctive and romantic; symmetry and a clear cleft matter.

Pro Tips from Our Sandy Springs Gemologist

• Compare shapes under Georgia daylight and indoor lighting—sparkle and outline feel different in person.
• Active lifestyle? Consider protective settings (bezels or thicker prongs) and shapes without sharp points.
• Smart budgeting: fancy shapes can cost less than rounds at the same carat, letting you upsize or improve specs.
• Use L:W ratio to choose between “soft & rounded” vs “sleek & elongated.”