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 the facets and proportions are arranged. A good cut makes the most of the light: brilliance (the white sparkle), fire (the flashes of color), and scintillation (the flicker you see as the stone moves). Knowing the difference helps you balance sparkle, style, and budget.

There is a catch worth knowing before you compare cut claims: GIA issues an overall cut grade for round brilliant diamonds only. GIA has announced cut grades for oval, pear and marquise beginning in 2027. For now, every other shape on this page comes back with polish and symmetry but no cut grade at all. So a superlative cut label on an oval or a pear came from a different laboratory or from the seller's own marketing. Our guide explains what Super Ideal, 8X and Excellent actually mean →

What Length-to-Width Ratio Means

Some shapes are elongated: oval, pear, marquise, emerald, and elongated cushion or radiant. For those, the length-to-width (L:W) ratio — how long the stone is compared with how wide it is — controls how slender or broad the diamond looks. A higher ratio looks more elongated. A lower ratio looks more rounded. Pick a ratio that matches your style and setting.

Which Shapes Can Look Bigger for the Carat

Some shapes spread wider across the top of the ring — most often oval, marquise, and pear. Their long outlines make them look bigger from the top. So they can appear larger than other shapes at the same carat weight.

Quick Guide to Popular Diamond Shapes

• Round Brilliant: Classic sparkle; strong all-around choice; for now the only shape GIA grades for cut, with cut grades for oval, pear and marquise announced for 2027. See custom round engagement rings →
• Oval: Elongates the finger; check for balanced bow-tie. See custom oval engagement rings →
• Cushion: Soft corners; square or elongated—ratio matters. See custom cushion cut engagement rings →
• Pear: Tapered elegance; symmetry and a protected tip are key.
• Emerald: Step-cut clarity; the open facets act like a window, so inclusions show more than in a brilliant cut. See custom emerald cut engagement rings →
• Princess: Modern square; the pointed corners concentrate color and need a protective setting.
• Radiant: Trimmed corners + brilliant facets; the sparkle of a round in an elongated shape. See custom radiant engagement rings →
• 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.

Popular Settings, by Style Rather Than Shape

A setting style works across most shapes above — these pages cover the STYLE, not a specific outline:

• Solitaire: One center stone, nothing else — works with any shape. See solitaire engagement rings →
• Three-Stone: A center stone with two side stones. See three-stone engagement rings →
• Vintage-Style: Milgrain, filigree and antique-inspired detail, built new. See vintage-style engagement rings →
• Asymmetrical: Toi et moi, east-west, bypass and offset designs. See asymmetrical engagement rings →

Any of these can be built as a custom engagement ring in Atlanta, and you can also browse our engagement rings online. You can read about our Lifetime Care as well.

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.
• Budget: fancy shapes can cost less than rounds at the same carat.
• Use L:W ratio to choose between “soft & rounded” vs “sleek & elongated.”

Specialty & Vintage-Inspired Shapes

Beyond the ten shapes above, some custom and Art Deco–inspired designs use specialty cuts with real vintage pedigree—most tracing back to the 1920s–30s. The lozenge (an elongated, diamond-shaped cut with two pointed ends), kite, and trapezoid are traditional geometric shapes still used today, most often as accent stones in three-stone and custom Art Deco–revival designs.

• Sharp points and corners mean protective settings—V-tip prongs or a bezel—matter more than with a round or oval.
• These are a smaller, specialty category. A matched pair for a symmetric design can take us longer to find, and sometimes the stones have to be cut to order. Plan for a few extra weeks.
• They pair beautifully with baguettes, trapezoids, and marquise accents in three-stone and Art Deco–inspired designs.

Classic shapes go in and out of the spotlight—marquise, for example, spent decades out of favor and is having a real comeback right now. See what’s trending for 2026 →

Picked your shape? See how we design custom engagement rings in Atlanta → Looking for more tips and services? View all guides in our Jewelry Learning Center →