A three stone ring places a center diamond between two smaller ones, and the trio is often taken to stand for past, present and future. That story is a big part of the appeal, both as an engagement ring and as a gift for a milestone anniversary. The layout also spreads light across the top of the finger, so the ring looks wider and fuller than a single stone of the same center weight. For finished ideas, browse three stone engagement rings for women.
The middle diamond should clearly lead. When the side stones come too close to its size, the eye loses the focal point and the design reads as a row instead of a centerpiece. When they are far smaller, they look like accents rather than partners. Judge the trio as a whole and ask whether the middle stone still commands attention. Shape plays a part in that balance too: elongated centers such as ovals already look larger for their weight, so they can stand beside slightly bigger companions and still lead. Because the sides add width, a center a little under the 1.5 carat mark still looks generous, and it costs noticeably less than one that reaches it.
Shapes can match or contrast. Three rounds give the most traditional look and the most even sparkle. An oval, cushion or emerald center between smaller side stones reads more tailored, and a step cut center such as an emerald deserves a clarity floor of VS1 or VS2, since its open facets show inclusions. Whatever the combination, keep the flanking stones close in tone to the middle one so none of the three looks warmer than its neighbors. Rectangular shapes are worth a look too: radiant cut diamonds pair an emerald-like outline with brilliant sparkle and hide inclusions well.
Three diamonds side by side make color differences easy to see, and white metals make them easier still. In white gold or platinum, keep the center at the upper end of near colorless; yellow and rose gold forgive a warmer set. If you have your heart set on a 3 stone white gold engagement ring, compare white gold three stone settings to see how a cool frame handles three white stones.
Unsure how the sizes will balance? Rare Carat's gemologists can talk through center and side stone proportions with you, and because they earn no commission, the advice is about the ring, not the bill.