When choosing a diamond, size perception can play a significant role in the decision-making process. Two of the most popular shapes, oval and round diamonds, are often compared not just for their brilliance but also for how large they appear. While both shapes have their own unique characteristics, many wonder if oval diamonds appear bigger than round ones. Let’s delve into why oval diamonds may seem larger, what factors influence size perception, and how to choose the best diamond shape for you.

Understanding Diamond Size Perception

The apparent size of a diamond isn't just about its carat weight. What truly matters is its face-up appearance—how large it looks when viewed from above. Several factors contribute to this, including the shape, cut depth, and the way carat weight is distributed. When comparing oval and round diamonds, it’s essential to understand how these elements come into play.

The Role of Shape in Visual Size

Different diamond shapes can have a significant impact on how large a diamond appears. While round diamonds are the most traditional shape, oval diamonds have gained popularity for their elegant and elongated form. Because of their shape, oval diamonds can often give the impression of being larger than their round counterparts, even when they weigh the same.

How Carat Weight is Distributed Across Shapes

Carat weight measures a diamond's physical weight, but it does not always determine how big a diamond will look. For example, a one-carat round diamond will generally appear smaller than a one-carat oval diamond. This is because the oval shape tends to distribute more of its weight across the surface area, creating a larger face-up appearance. If you're interested in exploring oval options, check out our selection of oval lab-grown diamonds.

Why Oval Diamonds Can Appear Bigger Than Round Ones

Larger Surface Area: Oval Diamonds’ Face-Up Appearance

One of the primary reasons oval diamonds appear larger is due to their larger surface area. The elongated shape of the oval cut maximises the diamond's face-up area, making it look bigger than a round diamond of the same carat weight. When viewed from above, the eye is naturally drawn along the length of the oval diamond, which enhances the perception of size.

Elongated Shape: Creating an Illusion of Length

The oval shape is known for its elegant, elongated appearance. This shape can make the diamond look not only larger but also create a slimming effect on the finger. The elongated form draws the eye along the diamond’s length, which can make it appear bigger compared to the more compact, symmetrical shape of a round diamond.

Shallower Depth in Oval Cuts

Oval diamonds often have a slightly shallower cut compared to round diamonds. This shallower depth can contribute to a larger face-up appearance because more of the diamond’s carat weight is visible from above. While round diamonds may have more depth, much of their weight is concentrated beneath the surface, making them appear smaller than oval diamonds with a similar carat weight.

Comparison with Round Diamonds: Where Round Cuts May Fall Short

While round diamonds are known for their brilliant sparkle, their deeper cut can result in a smaller face-up appearance. Much of the carat weight is hidden below the surface, which may not provide the same visual size impact as an oval diamond. The round shape also lacks the elongation that helps create the illusion of a larger diamond. If you prefer the timeless beauty of round diamonds, browse our round lab-grown diamonds to find the perfect choice.

When Round Diamonds May Appear Bigger Than Oval Ones

The Impact of Brilliance and Sparkle on Perceived Size

The round brilliant cut is specifically designed to maximise a diamond’s sparkle. This exceptional level of brilliance can draw attention and make the diamond appear larger than it actually is. For some, the eye-catching sparkle of a well-cut round diamond may offset its smaller face-up size compared to an oval diamond.

Symmetry and Shape Consistency in Round Diamonds

Round diamonds are perfectly symmetrical, which creates a balanced look that some may perceive as larger. The uniformity of the round shape provides a consistent appearance from all angles, whereas the elongated shape of an oval diamond may appear smaller or larger depending on how it is viewed.

Avoiding the Bow-Tie Effect in Ovals

One potential downside of oval diamonds is the bow-tie effect. This is a shadow that can appear across the centre of the diamond, resembling the shape of a bow tie. If the bow-tie effect is too prominent, it can detract from the diamond’s brilliance and make it appear smaller. To avoid this, it's essential to choose an oval diamond with a good cut that minimises the bow-tie effect. For other fancy shapes with unique appearances, you might also consider checking out fancy-coloured diamonds for something different.

Factors That Can Influence the Perception of Size

Ring Setting: Maximising the Appearance of the Diamond

The setting of the diamond can significantly impact how big it looks. For both oval and round diamonds, certain settings can enhance their visual size. Halo settings, for example, surround the centre diamond with smaller stones, creating a frame that makes the main diamond appear larger. Bezel settings or settings with thin bands can also make the central diamond stand out.

Colour and Clarity Considerations

While shape plays a crucial role in size perception, a diamond's colour and clarity can also influence how large it appears. Diamonds with higher clarity grades tend to look larger because their brilliance is not obstructed by inclusions. Similarly, diamonds with a high colour grade can appear brighter and more substantial. This is especially relevant for round diamonds, where high brilliance is a key feature.

Finger Size and Shape

The size and shape of the wearer’s finger can affect how large a diamond appears. For instance, oval diamonds often have a more elongating effect on the finger, making them ideal for shorter or wider fingers. Round diamonds, with their balanced shape, provide a classic look that works well on most finger shapes.

Tips for Choosing Between Oval and Round Diamonds

When to Choose an Oval Diamond

Oval diamonds are an excellent choice if you want a diamond that looks larger for its carat weight. Their elongated shape not only enhances the visual size but also provides a modern and distinctive appearance. If you prefer a diamond with a unique shape that still offers plenty of sparkle, an oval diamond might be the right option for you. For additional options in other unique shapes, consider exploring radiant lab-grown diamonds.

When to Choose a Round Diamond

If you prioritise maximum sparkle and a classic look, a round diamond is the way to go. The round brilliant cut is unmatched for its brilliance and fire, making it a timeless choice for engagement rings. Although round diamonds may not always look as large as oval diamonds of the same carat weight, their exceptional sparkle can make up for the difference.

Considering Personal Style and Ring Design

Ultimately, the choice between oval and round diamonds will depend on your personal style and the design of the ring. Oval diamonds may appeal to those seeking a contemporary look with an elegant touch, while round diamonds are ideal for traditionalists who want a classic, sparkling stone. Whichever shape you choose, consider how it fits with the setting and overall design of the jewellery.

FAQs

Do oval diamonds look bigger than round diamonds of the same carat weight?
Yes, oval diamonds often appear bigger than round diamonds of the same carat weight due to their larger surface area and elongated shape. The oval shape distributes more of the carat weight across the top, creating a larger face-up appearance.

Are oval diamonds less expensive than round diamonds?
Generally, oval diamonds are less expensive than round diamonds of the same carat weight and quality. This is because round diamonds are more in demand and require more rough material to achieve their shape, making them pricier.

What is the bow-tie effect in oval diamonds?
The bow-tie effect is a shadow that can appear across the centre of some oval diamonds. It resembles a bow tie and occurs due to the way light reflects within the diamond. Choosing a well-cut oval diamond can help minimise the bow-tie effect.

Do round diamonds sparkle more than oval diamonds?
Yes, round diamonds typically sparkle more than oval diamonds because the round brilliant cut is designed for maximum brilliance. However, oval diamonds still offer plenty of sparkle and may appear larger due to their shape.

Which diamond shape is better for an engagement ring?
Both oval and round diamonds are popular choices for engagement rings, but the best shape depends on personal preferences. Oval diamonds offer a larger appearance and a unique shape, while round diamonds provide unmatched sparkle and a classic look.