Oval Diamonds: The Complete Buying Guide
The oval diamond has become one of the most sought-after shapes in recent years, and it's easy to see why: it combines the brilliance of a round cut with an elongated silhouette that flatters the finger, often appears larger than a round of the same carat weight, and carries a distinctly contemporary feel without abandoning the sparkle that makes diamonds so compelling. But there are specific things to look for when choosing an oval that don't apply to other shapes.
Why Oval Diamonds Appeal
An oval diamond elongates the finger visually in a way that a round stone does not. Because the stone runs along the length of the finger rather than sitting as a compact circle, ovals tend to create a slimming effect on the hand — something many wearers notice and appreciate in daily wear. They also typically appear larger face-up than a round diamond of identical carat weight, because ovals spread their mass across a greater surface area relative to depth.
The cut is a modified brilliant, meaning oval diamonds use a faceting pattern derived from the round brilliant. This gives them genuine sparkle and fire, not the more understated glimmer of step cuts like emerald or Asscher.
The Bow-Tie Effect: What to Watch For
Almost all oval diamonds have some degree of a "bow-tie" — a dark, shadow-like area across the centre of the stone that resembles a bow tie when viewed face-up. The bow-tie occurs because of the way light interacts with the stone's facets in the centre, and it is difficult to eliminate entirely. The question is not whether the bow-tie exists but how pronounced it is.
A subtle bow-tie adds dimension and character to the stone without detracting from its overall appearance. A severe bow-tie makes the stone look dark across its middle and significantly reduces its visual appeal. This is genuinely something you need to see in person or in video — it does not show clearly in most static photographs, where lighting is controlled to minimise shadows. Always ask to view an oval diamond in motion before purchasing.
Length-to-Width Ratio: What Determines the Shape
Oval diamonds vary considerably in their proportions — some are elongated and narrow, others are rounder and more compact. The length-to-width ratio expresses this: a ratio of 1.30 to 1.50 is the most common and widely liked range, giving an oval that reads distinctly as oval without feeling excessively long or narrow. Ratios above 1.50 produce a more dramatic, elongated stone; ratios closer to 1.20 produce an oval that may read almost round on the finger.
The right ratio is personal — hand shape and personal aesthetic both play a role. If possible, trying different proportions on the actual finger (even with stand-in stones) is the most reliable way to find what feels right.
Settings That Work Well With Ovals
Oval diamonds work beautifully in solitaire settings, where the shape speaks for itself, and equally well with a halo that echoes the oval outline. A prong-set oval typically uses four to six prongs positioned at the tips and sides of the stone — the precise prong placement matters for both security and appearance, since poorly placed prongs can visually interrupt the oval's smooth outline.
East-west settings — where the oval is turned 90 degrees so it runs across the finger rather than along it — have become a popular alternative orientation, giving a striking, unconventional look.
Colour Considerations for Ovals
Oval diamonds, being brilliant-cut, tend to mask colour relatively well — a G or H colour grade oval will generally face up white in most settings. However, the tips of an oval stone can concentrate colour slightly more than the centre, which is worth keeping in mind when assessing colour on an unmounted stone. In most ring settings, this is minimised by the prongs that cover the tips.
If you'd like to explore oval diamonds and see how different proportions and bow-tie levels compare in person, book a consultation — it's the most reliable way to find the right stone for your hand.