What is the bowtie effect in oval diamonds?

The bowtie effect is a dark shadow across the centre of an oval diamond caused by light leaking from the stone. All oval diamonds have some degree of bowtie. A faint bowtie is normal; a strong bowtie detracts from the stone. Always view an oval diamond in person or on video before buying.

What length-to-width ratio is best for oval diamonds?

Most buyers prefer an oval diamond with a length-to-width ratio between 1.40 and 1.50, which is the classic range. Below 1.30 looks nearly round; above 1.55 gives pronounced elongation. The ideal ratio depends on personal preference and hand shape.

Are oval diamonds cheaper than round diamonds?

Yes. Oval diamonds typically cost 20–30% less than comparable round brilliants of the same carat weight. They also appear larger face-up than rounds of the same weight, making them excellent value.

What is the best setting for an oval diamond ring?

Oval diamonds suit solitaire, halo, east-west, and three-stone settings. Solitaire shows off the shape cleanly. Halo settings make the centre stone appear larger. East-west settings give a bold contemporary look. Three-stone settings with pear or round side stones create an elegant balanced design.

Oval Cut Diamond Engagement Rings: Complete Guide

Oval cut diamonds have become one of the most requested engagement ring shapes — and it's easy to see why. They offer the brilliance of a round diamond with a longer, more distinctive silhouette that elongates the finger and looks larger than their carat weight suggests.

Why Oval Diamonds Are So Popular Right Now

The oval is a modified brilliant cut — same facet structure as a round, same light performance, but with an elongated silhouette that flatters the finger and creates the illusion of greater size. Ovals typically look 8–10% larger face-up than rounds of the same carat weight.

Oval diamonds also tend to cost 20–30% less than comparable round brilliants, making them excellent value for buyers who want maximum visual presence per dollar.

The Bowtie Effect: What It Is and How to Avoid It

The bowtie effect is the most important thing to understand about oval diamonds. It's a dark shadow that runs across the centre of the stone, resembling a bowtie. It's caused by light leaking out of the diamond rather than returning to the eye, and it appears to some degree in virtually all oval cuts.

The degree varies enormously. A faint bowtie is normal and barely noticeable. A strong bowtie is a visible dark patch that detracts from the stone's beauty. Certificate grades do not capture it — the only reliable method is viewing the diamond in person or in detailed video, under multiple lighting conditions.

At Diamond Ateliers, we video every oval diamond under diffused and spotlight conditions before presenting it to a client.

Length-to-Width Ratio: Finding the Right Shape

The length-to-width (L:W) ratio of an oval determines how elongated it appears:

1.30–1.40 — fuller, rounder oval; less elongated but very balanced
1.40–1.50 — classic oval proportions; the most widely requested range
1.50–1.60 — more pronounced elongation; especially flattering on shorter fingers

For depth percentage, aim for 58–64%. Too shallow and the diamond looks watery; too deep and you lose carat weight in the base.

Best Settings for Oval Diamonds

Solitaire — the cleanest presentation. A 4 or 6-prong basket with prongs at the tips and sides protects the stone while showing off its shape.
Halo — a ring of smaller diamonds surrounds the oval, making the centre stone appear even larger.
East-west — rotating the oval 90° so it sits horizontally across the finger is a bold, contemporary choice.
Three-stone — oval centre with round or pear side stones creates a balanced, elegant composition.
Pavé band — a simple pavé or micro-pavé band adds sparkle without competing with the oval's outline.

Oval Diamond Colour and Clarity

Oval diamonds retain colour more than round brilliants — the elongated shape concentrates colour at the tips. For a white oval, consider G colour or better. H may show slight warmth in some lighting, though in yellow gold settings it can look warm and intentional.

For clarity, VS2 or SI1 is usually eye-clean in ovals. Eye-clean is what matters — inclusions that don't affect appearance aren't worth paying a premium to avoid.

Custom Oval Diamond Engagement Rings in Singapore

At Diamond Ateliers, we design and make custom oval diamond engagement rings from first consultation to final piece. Every diamond is GIA or IGI certified, and we present diamonds in person and on video so you can assess the bowtie before committing.

Oval Cut Diamond Engagement Rings: What to Know Before You Buy