Side stones are essential accessories for diamond engagement rings and pendants. They enhance the brilliance of the center stone, create a balanced visual effect, and avoid the plain look of a single large diamond. Colored center diamonds paired with white side stones have become a popular trend in overseas jewelry design for their distinct color contrast.
This guide covers all key factors for matching side stones, including quantity, size, color, clarity, proportion, setting and cut. It provides practical and standard references for matching side stones with different center stones.
Choose Loose Side Stones for Flexible Matching
Purchasing paired loose diamonds as side stones offers more flexibility three-stone ringthan finished fixed designs. Loose stones can be selected and adjusted according to the center diamond’s carat, color and cut to fit different design needs.
What Diamond Shapes Are Commonly Used as Side Stones?
The right shape often depends on the outline of the center stone and the overall effect you want to create. Side stones come in more shapes than many people realize. Some are chosen to add extra sparkle, while others are used to frame the center diamond, extend its silhouette, or create a smoother transition into the band.
Traditionally, side stones were selected to complement both the shape and faceting style of the center diamond. An Asscher-cut center stone, for instance, is often paired with step-cut trapezoids for a clean and harmonious look. Today, these combinations are better viewed as design principles rather than fixed rules. Colored center diamonds, contrasting side-stone shapes, and more unexpected pairings are increasingly being used to create rings with a stronger sense of individuality. Classic combinations remain timeless, but a thoughtfully balanced modern pairing can be just as elegant—and often far more distinctive.
Trapezoid-Cut Diamond Side Stones
Trapezoid-cut diamonds have a wonderfully architectural quality. Their angled sides naturally lead the eye toward the center stone, making the entire ring appear wider and more balanced without taking attention away from the main diamond.
Most trapezoid side stones are step-cut, so their beauty is less about constant sparkle and more about clean flashes of light, crisp symmetry, and visual depth. They pair especially well with emerald, Asscher, radiant, and elongated center stones.
If you like a three-stone ring that feels polished, structured, and quietly luxurious, trapezoid diamonds are an excellent place to begin.
Baguette Diamond Side Stones
Baguette diamond side stones bring a sense of order and quiet sophistication to a ring. This gives baguette side stones a calmer and more refined presence, allowing them to add structure without competing with the center stone.
Straight baguettes are especially well suited to symmetrical three-stone settings and Art Deco-inspired designs. They pair naturally with emerald, Asscher, princess, radiant, and round center diamonds, depending on whether you want to echo the main stone’s geometry or introduce a subtle contrast. Their uniform shape also gives the ring a wider, more composed appearance across the finger.
For someone drawn to precise lines, balanced proportions, and understated elegance, baguette diamond side stones offer a timeless choice that feels polished without being overly decorative.
Tapered Baguette Diamond Side Stones
Tapered baguette diamonds have a way of making the center stone feel naturally more important. Their long, clean lines gradually narrow toward one end, guiding the eye inward and creating a smooth transition from the center diamond to the band.
They are especially beautiful beside emerald, radiant, Asscher, oval, and elongated cushion-cut center stones. Because their proportions can be adjusted to follow the outline of the main diamond, tapered baguettes often make a three-stone setting feel more seamless and thoughtfully composed. They are an ideal choice if you want added width and structure while keeping the overall design refined and uncluttered.
Half-Moon Diamond Side Stones
Half-moon diamonds bring softness to a three-stone setting. One side is gently curved while the other remains straight, allowing the stones to sit closely beside the center diamond almost as though they were shaped specifically to embrace it.
They add noticeable width and brilliance, but their rounded outline keeps the overall design from feeling too sharp or formal. Half-moon side stones are especially flattering beside oval, emerald, radiant, cushion, and elongated center diamonds. The result feels graceful and balanced, with just enough sparkle to make the center stone appear even more prominent.
Trillion-Cut Diamond Side Stones
Trillion-cut diamonds bring energy and movement to a ring. Their triangular outline feels modern and distinctive, while the brilliant-style facets produce a lively sparkle that contrasts beautifully with a larger center stone.
Depending on the setting, the pointed ends may face inward for a compact, dramatic look or outward to create a broader silhouette across the finger. Trillion side stones can complement round, princess, radiant, cushion, and emerald-cut center diamonds. They are a strong choice when you want a three-stone ring to feel bright and expressive rather than strictly traditional.
Rounded Trillion Diamond Side Stones
Rounded trillion diamonds offer the distinctive character of a triangular stone, but with a softer and more approachable finish. Their gently curved sides and rounded corners take away some of the sharpness associated with a traditional trillion cut, creating a look that feels bright, graceful, and beautifully balanced.
Their brilliant-style facets bring plenty of sparkle, while the softened outline allows them to sit comfortably beside both angular and rounded center stones. They pair particularly well with oval, cushion, radiant, round, pear, and emerald-cut diamonds, adding noticeable presence without making the setting feel overly geometric.
In a three-stone ring, rounded trillions can make the center diamond appear wider and more luminous. They are a lovely choice for someone who appreciates the energy of a trillion cut but prefers a design that feels a little more fluid, romantic, and easy to wear.
Bullet-Cut Diamond Side Stones
Bullet-cut diamonds combine the clean length of a baguette with a more pronounced pointed end. The shape feels sleek, directional, and slightly unexpected, giving a three-stone ring a sharper and more tailored appearance.
Because bullet diamonds are commonly step-cut, they display broad flashes of light rather than the scattered sparkle of a round brilliant. They look particularly striking beside emerald, Asscher, radiant, and other geometric center stones. The pointed outline creates a smooth visual transition from the main diamond toward the band, making the design feel deliberate from every angle.
Shield-Cut Diamond Side Stones
Shield-cut diamonds are made for designs that deserve a closer look. Their angular outline can appear bold at first, yet when placed on either side of a center stone, the symmetry feels surprisingly balanced and refined.
Some shield diamonds have a broader, more geometric profile, while others are slightly elongated or softly curved. This variety gives designers plenty of freedom to match the side stones to the proportions of the center diamond. Shields work especially well with emerald, radiant, Asscher, pear, and other distinctive cuts, adding character without making the ring feel unnecessarily ornate.
French-Cut Diamond Side Stones
French-cut diamonds have a charm that feels both geometric and romantic. Their square or rectangular outline is usually finished with a small table and angled crown facets, creating a pattern of light that resembles tiny panes of glass.
Rather than producing intense, scattered brilliance, French cuts offer a softer, rhythmic shimmer. They are often seen in vintage-inspired and Art Deco designs, especially along the shoulders of a ring or arranged in a channel setting. Used beside a center diamond, they add texture and history to the design while keeping the overall silhouette clean and sophisticated.
Round Brilliant Diamond Side Stones
Round brilliant diamonds are the most versatile side stones for a reason. Their balanced shape and lively sparkle can complement almost any center diamond, from classic round and oval stones to more angular emerald and princess cuts.
Beside a geometric center stone, round diamonds soften the overall look. Next to a rounded center stone, they create a smooth and harmonious continuation of brilliance. They can be used as two substantial side stones, arranged in graduated sizes, or carried into the band as smaller accent diamonds. The effect is familiar, bright, and effortlessly elegant.
Side Stone Quantity Option
The number of side stones affects the design, craftsmanship and maintenance of diamond jewelry. The common matching options are as follows.
Two side stones are the most classic and universal option. The symmetrical design fits all ring and pendant styles with a simple and elegant look.
Five side stones surrounding the center stone create a full and luxurious appearance, suitable for elaborate and gorgeous jewelry styles.
Some niche designs adopt main-stone-sized side stones with invisible pave setting of tiny diamonds for a unique sparkling effect.
More side stones require finer inlay craftsmanship and need regular cleaning due to more gaps. High-quality setting ensures firm fixation and long-lasting luster with daily normal wear.
How Big Should Side Stones Be?
As a general guideline, side stones should be approximately half to two-thirds the size of the center stone—around 50% to 65%. For a more precise comparison, especially when working with a particular ring design, the average diameter of each stone should also be considered.
When a ring features more than two side stones, they are typically noticeably smaller than the center diamond. In a classic three-stone setting, with one diamond placed on either side of the center stone, the side stones may be only slightly smaller, creating a fuller and more balanced look.
How To Choose The Right Color Grade For Side Stone
The color grade difference between paired side stones shall not exceed one grade. Side stones shall not be more than one grade lower than the center stone. For an F-grade center stone, the maximum side stone grade is G.
If you choose the colored diamonds as center stone, then DF-grade white side stones are ideal for colored center stones to maximize the color saturation of colored diamonds.
Three Common Side Stone Diamonds Settings
Prong Setting: The most popular setting. It maximizes diamond exposure for better brilliance and is easy to clean and maintain.
Channel Setting: Higher safety and protection for diamonds. Less diamond surface is exposed, resulting in slightly lower brilliance and higher maintenance difficulty.
Bezel Setting: The safest setting with full-edge protection. It prevents falling and collision, yet partially covers the diamond and reduces visual size.
We’re Here To Help
We are able to match center stones to your side stones. We can even send you a picture of the center stone with two side stones so you can see exactly what they look like.
If you have any questions about diamond jewelry, we can always be contacted here where one of our expert diamond jewelers will be happy to assist you.
Learn more about side stone engagement rings, from choosing a matching wedding band to understanding whether a side stone ring can be resized safely. For additional tips and buying advice, explore our engagement ring guide.
