Round vs Oval Cut Diamonds: Which Shape Is Right for You?

Round and oval cut diamonds are currently the two most popular shapes for engagement rings in Australia — and for good reason. Both are brilliant cut stones (meaning they're designed to maximise sparkle), but they have distinct personalities, and the choice between them often comes down to the look you're after and how each sits on the hand.

The Round Brilliant

The round brilliant is the classic — the most researched, most refined diamond cut in existence. It has 58 facets specifically arranged to return the maximum amount of light, producing extraordinary brightness and fire. It's symmetrical in all directions, meaning it looks the same from every angle.

Round diamonds tend to look slightly smaller face-up for their carat weight compared to ovals, but they're unmatched in terms of brilliance. They're also the easiest cut to buy confidently — the standardised cut grades (Excellent, Very Good) give you a reliable indication of quality.

If you want a ring that will never feel dated, the round brilliant is a safe and stunning choice.

The Oval Cut

Oval cut diamonds have surged in popularity over the past several years, driven partly by high-profile celebrity engagements and partly by the very real visual advantages they offer. An oval appears larger face-up than a round of the same carat weight — often 10–15% larger — because its elongated shape covers more surface area.

The elongated shape also creates a flattering, lengthening effect on the finger. For someone who wants a ring that feels substantial and elegant without going up significantly in carat (and cost), an oval is an excellent choice.

The trade-off: oval diamonds can exhibit a "bow-tie effect" — a dark shadow across the centre of the stone — when the faceting isn't optimal. Selecting a well-cut oval means looking at the actual stone (or good photographs) rather than relying on grades alone.

Which Should You Choose?

Choose round if you value maximum brilliance, a timeless look, and easy quality comparison. Choose oval if you want a larger face-up appearance, a more distinctive silhouette, and something with current fashion momentum.

Both are beautiful — and both look stunning in the right setting. Explore our oval cut engagement rings and round cut engagement rings to compare them side by side.

Explore Oval-Cut Rings at Una Diamond

If this article has convinced you to try oval, here's where to start:

• The Georgina — an oval-cut lab-grown diamond solitaire in 18K gold or platinum
• Browse all oval-cut rings →