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0.5 Carat Radiant Cut Platinum Laboratory-Grown Diamond Halo Ring with Three-Row Pave Band
Price$4,729$9,458Ends Soon
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These 1/2 carat lab-grown diamond rings come with the center already set, and the price includes it. Choose from ten shapes and a range of styles: solitaires with plain or pave bands, a hidden halo, a vintage-style halo, a three stone ring, and side-accent designs. Each is offered in platinum or 10K, 14K or 18K white, yellow or rose gold, a simple path to a half carat engagement ring.
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 →Buying guide
A 0.5 carat round lab-grown diamond is about 5 mm across. Oval, pear and marquise centers stretch that weight into a longer outline and look a little bigger from above, while princess, asscher and cushion shapes look compact and square. Emerald and radiant cuts sit between the two. Picking the shape you like best matters more at this size than chasing extra weight.
A plain solitaire keeps the look clean. A pave band, a hidden halo or a halo adds small lab-grown diamonds around or below the center, which makes the top of the ring look fuller. The three stone design and the marquise or pear side-accent styles widen the ring across the finger. Those accents add to the ring's overall stone weight; the 0.5 carat figure always means the center stone.
Platinum is naturally white and heavy, and it costs more. Gold comes in 10K, 14K and 18K, in white, yellow or rose. Lower karats wear harder, and higher karats show deeper color. The metal you choose changes the price more than the style does.
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.
At RJ, a 0.5 carat ring with its lab-grown diamond center set starts under $800, and most are between about $1,050 and $1,200 in the lowest-priced metal. Platinum and 18K gold cost more. Lab-grown diamonds cost far less than natural diamonds of the same size, and they have little resale value, so buy the ring to wear rather than as an investment. The gold or platinum keeps its metal value.
No. A half carat center is a popular size that looks neat and well proportioned on most hands, especially on a slim band. If you want it to look larger, choose an elongated shape such as oval, pear or marquise, or add a halo or pave band. Those accents add sparkle around the 0.5 carat lab-grown diamond center without changing its weight.
A 0.5 carat round center is about 5 mm across, roughly the width of a pencil eraser, and sits comfortably within the width of most fingers. Ovals measure about 6 by 4 mm and look slightly larger from the top. On these rings the center can be set alone on a plain band or framed by a halo, pave or side accents of small lab-grown diamonds.
