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3.5 Carat Heart-Shaped Platinum Laboratory-Grown Diamond Solitaire Engagement Ring with Plain Band
Price$3,589$7,178Ends Soon
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Each 3.5 carat lab-grown diamond platinum ring in this collection arrives with its 3.5 carat center already set, and the price covers the finished ring. Choose from ten center shapes, from round and oval to emerald, Asscher and heart, then pick a solitaire, a halo or hidden halo, a three stone ring or a ring with side accents.
From timeless solitaires to dazzling halos and vintage-inspired designs, explore the most-loved engagement ring settings — and find the style that tells your story.
A single diamond, beautifully unadorned — the timeless, most-loved setting that puts your stone center stage.
Shop Solitaire Rings →A circle of pavé diamonds frames the center stone, adding sparkle and making it look noticeably larger.
Shop Halo Rings →Three diamonds symbolising your past, present and future — a meaningful design with extra brilliance.
Shop Three-Stone Rings →Tiny diamonds set along the band catch the light from every angle for all-over shimmer.
Shop Pavé Rings →Intricate milgrain and antique-inspired detailing, for a ring with timeless, heirloom character.
Shop Vintage Rings →Two interwoven bands of metal and diamonds create a modern, dynamic silhouette.
Shop Twisted Shank Rings →Keep exploring
Buying guide
Platinum is a dense, naturally white metal. It keeps its color without the replating white gold needs, so nothing warm shows through behind a colorless center. Its weight gives a 3.5 carat ring a solid feel on the hand, and its prongs keep their mass well over years of wear. With time the surface softens to a satin patina, and a polish brings back the shine.
The 3.5 carat figure is the center alone. Pavé, halos and side accents are extra lab-grown diamonds set beyond the center.
Round gives the most sparkle and the most traditional look. Oval, pear and marquise spread the center over a longer outline that flatters the finger. Emerald and Asscher cuts trade sparkle for broad, glassy step facets, and they show the stone's clarity openly. Princess, cushion and radiant pair a square or rectangular outline with brilliant faceting, and heart is the most playful choice.
Each ring is made for you in 10–15 days. Shipping is free on orders over $500, returns are accepted within 30 days, and one resize is free within 60 days of delivery.
Prices start at about $3,500, and most rings in this collection cost between about $4,000 and $4,300. That price covers the finished platinum ring with its 3.5 carat lab-grown diamond center already set. Styles with pavé, a halo or side accents cost more than a plain solitaire. Lab-grown diamonds cost far less than natural diamonds of the same size.