Oval Cut Diamonds: Pros and Cons Before You Buy
An oval cut diamond is an elongated modified brilliant cut — essentially a round brilliant stretched along one axis. It produces exceptional brilliance, creates the illusion of greater size per carat than a round stone, and has a flattering lengthening effect on the finger. The trade-off is the bow-tie effect: a dark shadow that appears across the centre of most ovals, which ranges from barely visible to distractingly obvious depending on the cut quality.
TL;DR: Oval cut diamonds offer more face-up size per carat than round brilliants, a finger-elongating profile, and strong light return. The main consideration is bow-tie severity, which varies significantly between stones and must be assessed in person or via video rather than from a certificate alone. IGI and GIA certified oval diamonds are available for bespoke commissions at À Vie Diamonds.
What Is an Oval Cut Diamond?
The oval brilliant was developed in the late 1950s and follows the same faceting principle as the round brilliant — 58 facets arranged to maximise light return and scintillation. The elongated shape is achieved by adjusting the outline rather than the facet structure, which is why oval cuts achieve brilliant-grade fire and sparkle.
The length-to-width ratio of an oval determines how elongated it appears. A ratio of 1.35:1 to 1.50:1 is considered classic. Below 1.30:1 the stone looks nearly round; above 1.60:1 it begins to look narrow.
Oval Cut Diamond Pros
Greater face-up size per carat. An oval diamond has more visible surface area than a round brilliant of the same carat weight. A 1.0ct oval typically measures around 8.0 x 5.5mm face-up; a 1.0ct round brilliant measures approximately 6.5mm in diameter.
Finger-lengthening effect. The elongated shape runs along the finger rather than sitting as a circle, which creates a slimming and lengthening visual effect. This is particularly noticeable on shorter fingers.
Strong brilliance. Because the oval shares the round brilliant’s faceting structure, it achieves excellent light return. It is among the brightest fancy shapes available.
Versatility in settings. Ovals suit solitaire, halo, side stone, and pavé settings equally well. They work in east-west orientation for a more contemporary look, or in the traditional north-south orientation.
Slightly lower price per carat than round. Round brilliants command a consistent premium because they are the most in-demand shape. Ovals are typically 10 to 20 per cent less per carat for equivalent quality grades.
Oval Cut Diamond Cons
The bow-tie effect. A bow-tie is a dark shadow across the centre of an oval diamond, caused by the way light passes through the elongated shape. Every oval has some degree of bow-tie; the question is severity. A faint bow-tie is barely visible in normal lighting. A severe bow-tie is a prominent dark band that reduces the stone’s appeal significantly. This cannot be assessed from a certificate — it must be seen in person or via video.
More sensitive to colour grade. Ovals tend to show colour more readily than round brilliants, particularly toward the pointed ends of the stone. A buyer who would be comfortable with H colour in a round brilliant may prefer G or above in an oval.
Length-to-width ratio is subjective. There is no universally correct oval — preferences vary, and it is worth viewing multiple stones before deciding.
Oval vs Round Diamond: A Direct Comparison
| Factor | Oval cut | Round brilliant |
|---|---|---|
| Face-up size per carat | Larger | Smaller |
| Brilliance | Excellent | Excellent |
| Bow-tie effect | Yes (varies) | No |
| Colour visibility | More visible | Less visible |
| Price per carat | 10–20% lower | Premium |
| Setting versatility | Very high | Very high |
| Finger lengthening | Yes | No |
| Popularity trend | Rising sharply | Consistently high |
How to Choose a Good Oval Diamond
Prioritise cut quality over the certificate. GIA and IGI do not issue cut grades for fancy shapes the way they do for round brilliants. The quality of an oval depends on its proportions, symmetry, and the severity of its bow-tie — none of which is fully captured by a grade on paper. Always view the stone under normal light before committing.
Assess the bow-tie honestly. A faint bow-tie is acceptable; it adds a subtle character to the stone. A strong bow-tie significantly reduces the stone’s visual appeal and is not worth accepting regardless of how attractive the other grades are.
Choose length-to-width ratio by eye. Look at ovals between 1.35:1 and 1.50:1 first. If the wearer prefers a more elongated look, move toward 1.55:1 or 1.60:1.
Colour grade: G or above recommended. For a white gold or platinum setting, G is a sensible minimum. F or above if the wearer is particularly sensitive to colour.
Clarity: VS2 or above is typically eye-clean. In an oval’s brilliant faceting, inclusions are reasonably well hidden. VS2 is a good balance of value and cleanliness.
Oval Diamonds in Bespoke Rings
Oval diamonds are one of the most popular choices for bespoke engagement ring commissions at À Vie Diamonds. They suit a wide range of settings — from a simple four-claw solitaire to a full pavé band — and the finger-lengthening effect makes them a frequent choice for wearers who prioritise elegant proportions.
We source IGI and GIA certified oval diamonds and provide video and photography of each stone before you confirm your selection, specifically so you can assess the bow-tie in realistic lighting conditions.
Explore our full diamond shapes guide to compare ovals with other fancy shapes, or visit our cut guide for more on how faceting affects a diamond’s appearance. For a personalised recommendation, get in touch.
Frequently Asked Questions
Do all oval cut diamonds have a bow-tie? Yes, to some degree. Every oval diamond has a bow-tie effect. The question is severity — a faint bow-tie is perfectly acceptable; a strong one meaningfully reduces the stone’s beauty. This cannot be assessed from a certificate and must be seen in person or via video.
Is an oval diamond cheaper than a round diamond? Oval diamonds are typically 10 to 20 per cent less expensive per carat than round brilliants of equivalent colour and clarity grades.
What is the best length-to-width ratio for an oval diamond? The most balanced and widely flattering range is 1.35:1 to 1.50:1. Personal preference within this range varies, and it is worth viewing multiple stones before deciding.
What colour grade should I choose for an oval diamond? In a white gold or platinum setting, G colour or above is recommended. Ovals show colour more readily than round brilliants, particularly toward the tips.
What setting works best with an oval diamond? Ovals are highly versatile and suit most setting styles. A simple four or six-claw solitaire lets the stone’s shape and brilliance lead. A pavé side stone band adds visual width. East-west orientation in a simple bezel or claw setting is a contemporary choice that works well with minimal bands.
Last reviewed: July 2026 · À Vie Diamonds