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3 Carat Round Platinum Laboratory-Grown Diamond Solitaire Engagement Ring with Pave
Price$2,709$5,418Ends Soon
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This is our edit of the 3ct round solitaire lab-grown diamond ring: a round 3 carat lab-grown diamond center, already set and included in the price, on a band that lets it stand alone. Choose white, yellow or rose gold in 10K, 14K or 18K, or platinum, and a plain, thin, rounded or pavé band.
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
The round brilliant is cut to return as much light as possible, so it gives the most sparkle of any shape. A 3 carat round measures roughly 9 mm across, a size that reads clearly on the hand without looking oversized. With no halo or side stones to frame it, the cut does all the work, which is why round and solitaire are such a common pairing.
These 3 carat round solitaire lab-grown diamond engagement rings come in a few looks. A thin plain band keeps the outline minimal. A rounded plain band feels smooth and comfortable. A pavé band adds small lab-grown diamond accents along the shoulders. A cathedral setting lifts the center on arches over a graduated pavé band, and a hidden halo places a ring of small stones under the center, visible from the side. Accents add to the ring's total.
White gold and platinum match the color of the stone, while yellow and rose gold give a warm contrast. Prices start from about $2,100 for the finished ring, and most sit between about $2,300 and $2,450 in the lowest metal option.
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.
