Diamond Shapes Explained: How to Choose the Perfect Shape for Your Ring
Choosing a diamond is about more than just sparkle – the diamond shape defines the entire look and personality of a ring. Whether you’re designing an engagement ring, upgrading a special piece, or learning more before you buy, understanding diamond shapes will help you make a confident, informed decision.
In this guide, we break down the most popular diamond shapes, what makes each unique, and who they suit best – with a South African buyer’s perspective in mind.
What Is a Diamond Shape?
A diamond’s shape refers to its outline or silhouette, such as round, oval, square, or pear. When looking at the 4C’s of Diamonds, the Cut refers to the shape of the diamond.
Shape affects:
- The ring’s overall style
- How large the diamond appears
- How light reflects
- The personality and symbolism of the piece
Round Brilliant Cut (RBC)
Best for: Timeless elegance & maximum sparkle
The most popular diamond shape worldwide, round diamonds are expertly cut to reflect the most light. They suit almost any setting and never go out of style.
Why choose it:
- Maximum brilliance
- Classic and versatile
- Ideal for first-time buyers
Oval
Best for: A modern twist on a classic look
Oval diamonds offer similar brilliance to round stones but with an elongated shape that can make fingers appear longer and slimmer.
Why choose it:
- Elegant and flattering
- Appears larger per carat
- Very popular in modern engagement rings
Princess (Square)
Best for: Contemporary, bold styles
Princess-cut diamonds have sharp corners and a square or slightly rectangular shape. They offer excellent sparkle with a modern edge.
Why choose it:
- Clean, modern look
- Great sparkle
- Excellent value for money
Emerald
Best for: Understated luxury & vintage lovers
Emerald-cut diamonds feature long, step-cut facets that create a hall-of-mirrors effect rather than intense sparkle.
Why choose it:
- Sophisticated and elegant
- Highlights clarity
- Ideal for minimal, classic designs
Cushion
Best for: Romantic and vintage-inspired styles
With soft corners and a pillow-like shape, cushion cuts blend old-world charm with modern brilliance.
Why choose it:
- Warm, romantic feel
- Works beautifully in halo settings
- Great for antique-inspired rings
Pear
Best for: Unique, statement designs
Pear-shaped diamonds combine round and marquise elements, creating a teardrop silhouette that stands out.
Why choose it:
- Eye-catching and distinctive
- Creates an elongated look
- Ideal for someone who wants something different
Marquise
Best for: Bold personalities & dramatic flair
Marquise diamonds have pointed ends and a long shape, maximizing perceived size and finger length.
Why choose it:
- Appears larger than many other shapes
- Regal, vintage feel
- Perfect for statement rings
Radiant
Best for: Sparkle with structure
Radiant-cut diamonds combine the brilliance of round diamonds with the clean lines of emerald cuts
Why choose it:
- Exceptional sparkle
- Strong, modern shape
- Great for both classic and contemporary designs
How to Choose the Right Diamond Shape
When choosing a diamond shape, consider:
- Personal style – classic, modern, or bold?
- Lifestyle – active lifestyles may benefit from rounded edges
- Finger shape – elongated shapes create a slimming effect
- Budget – some shapes offer better size-per-carat value
There’s no “best” shape – only the one that feels right for you.
Diamond Shapes & South African Buyers
South African buyers often look for a balance between timeless design, long-term value, and ethical sourcing. Shapes like round, oval, and emerald remain consistently popular, while pear and marquise shapes appeal to those seeking individuality.
If you’re unsure, viewing different shapes in person can make all the difference.
Final Thoughts
Understanding diamond shapes empowers you to choose a ring that reflects your story, style, and values. Whether you’re drawn to classic brilliance or modern elegance, the right shape brings your jewellery to life.
If you’re still deciding, explore our guides on lab-grown vs natural diamonds and how to choose a ring your partner will love to complete your journey.