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4.8 (912 reviews) · the jewelry store on 47th Street
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3 ct marquise center · lab-grown#71345
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct marquise center · lab-grown · #71345
A 3 carat lab-grown marquise in E color and VS1 clarity, set in 14K gold with 0.45 carats of round side diamonds in F color. E is the second grade on the color scale, one step whiter than the side...
Best seller
3 ct marquise center · lab-grown#69649
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct marquise center · lab-grown · #69649
A marquise lab-grown diamond of 3.00 carats, F color and VS1 clarity, sits in a cathedral setting, where the shoulders of the ring rise up to meet the center stone. Pavé along the band adds...
3 ct oval center · lab-grown#69569
Sizes 5–8, half sizesSizes 5 to 8, half sizes18K gold · 3 ct oval center · lab-grown · #69569
Three carats, oval, lab-grown: the center diamond of this 18K gold engagement ring weighs 3.00 carats, in E to F color and VS1 clarity. An oval spreads along its length, so it tends to look larger...
Best seller
3 ct center · lab-grown#71303
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct center · lab-grown · #71303
The Astral holds a 3.00 carat elongated cushion lab-grown diamond, F color and VVS2 clarity, in prongs, with 0.30 carats of round lab-grown side diamonds. The band is 1.80 mm wide and the ring...
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Best seller
3 ct oval center · lab-grown#68285
Made to order · Sizes 4–9, half sizesMade to order18K gold · 3 ct oval center · lab-grown · #68285
A 3.00 carat oval, lab-grown, alone on an 18K gold band. One diamond in F color and VVS clarity, held up in prongs that leave it open to the light. An oval's long outline runs along the finger and...
3 ct cushion center · lab-grown#70688
Sizes 5–9, half sizes18K gold · 3 ct cushion center · lab-grown · #70688
The Trilogy Cushion Glow is a cushion cut three-stone diamond engagement ring built around a glowing cushion-cut center stone flanked by two matched side diamonds — a silhouette that reads balanced...
3.5 ct emerald center · lab-grown#69069
Made to order · Sizes 5–9, half sizesMade to order14K gold · 3.5 ct emerald center · lab-grown · #69069
The Veronica Emerald Engagement Ring features a 3.50 carat emerald-cut lab grown diamond set in solid 14K gold. A slim 2.00mm band is accented with lab grown diamonds in a double shared-prong...
Best seller
3 ct pear center · lab-grown#71607
Sizes 4–9, half sizes14K gold · 3 ct pear center · lab-grown · #71607
Three carats of lab-grown pear, E color and VVS2 clarity, sit at the center of this Mirabella, with 0.70 carats of round side diamonds on a ring of 14K gold. A pear carries most of its weight in its...
3.6 ct radiant center · lab-grown#68633
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3.6 ct radiant center · lab-grown · #68633
Radiant cut, 3.60 carats, lab-grown: the center diamond is F color and VS2 clarity, held in prongs, with 0.60 carats of round diamonds set pavé along the band. A radiant has the outline of an...
3 ct emerald center · lab-grown#71621
Sizes 5–8, half sizesSizes 5 to 8, half sizes14K gold · 3 ct emerald center · lab-grown · #71621
A 3.0 carat emerald-cut lab-grown diamond, F color and VS1 clarity, is the center of this 14K gold engagement ring, with 0.50 carats of round lab-grown side diamonds in F color and VS1 clarity, all...
3 ct center · lab-grown#71137
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct center · lab-grown · #71137
The Willow keeps its halo out of sight. From above you see one 3.00 carat elongated cushion, lab-grown, F color and VS clarity, in 14K gold; from the side, a hidden halo, a ring of small diamonds...
3 ct oval center · lab-grown#71793
Sizes 4–9, half sizes14K gold · 3 ct oval center · lab-grown · #71793
A 3.0 carat oval lab-grown center diamond in E color and VVS2 clarity, prong set in 14K gold with 0.75 carats of lab-grown round diamonds of the same color and clarity. The ring weighs 4.0 grams. An...
3 ct marquise center · lab-grown#71499
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct marquise center · lab-grown · #71499
A marquise and trillions: the Rosaline sets a 3.00 carat marquise lab-grown diamond, F color and VVS clarity, with 1.15 carats of trillion cut lab-grown side diamonds, all in prongs, on a pavé...
3 ct emerald center · lab-grown#70982
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct emerald center · lab-grown · #70982
The emerald in the Clara's name is the cut, not a green stone: a 3.0 carat emerald cut lab-grown diamond, F color and VS1 clarity, with 0.65 carats of emerald cut lab-grown side diamonds, all...
lab-grown#68640
Sizes 4–9, half sizes18K gold · lab-grown · #68640
Solitaire in 18K: a 3.00 carat cushion lab-grown diamond, E color and VS2 clarity, held in prongs on a band 2.3 mm wide. The cushion is an elongated one, longer than it is wide. The ring weighs...
3 ct radiant center · lab-grown#70117
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct radiant center · lab-grown · #70117
A 3.00 carat radiant cut lab-grown diamond, F color and VVS2 clarity, held in claws over a hidden halo that shows from the side; the smaller diamonds total 0.15 carats. The band is 1.8 mm wide and...
3 ct round center · lab-grown#71519
Made to order · Sizes 4–9, half sizesMade to order18K gold · 3 ct round center · lab-grown · #71519
A hidden halo of side diamonds, 0.15 carats of them, sits below the 3 carat lab-grown round at the center of this 18K gold engagement ring. The center stone is F color and VS clarity, prong set; the...
3 ct center · lab-grown#71670
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct center · lab-grown · #71670
The Diana is an engagement ring with a 3.00 carat elongated old mine cushion lab-grown diamond, F color and VS1 clarity, in prongs on a 14K gold band 2 mm wide. The ring weighs 3.50 grams. The old...
3.12 ct princess center · lab-grown#68194
Sizes 5–11, half sizes14K gold · 3.12 ct princess center · lab-grown · #68194
Square with sharp corners: a 3.12 carat lab-grown princess cut diamond in G color and VS1 clarity, prong set at the center of a 14K gold engagement ring. Natural side diamonds, also princess cut,...
3.02 ct round center · lab-grown#70119
Sizes 4–10, half sizes14K gold · 3.02 ct round center · lab-grown · #70119
A round brilliant lab grown diamond sits center-stage in this solitaire engagement ring — clean lines, no distractions, all presence. This lab grown solitaire diamond engagement ring delivers the...
3.09 ct princess center · lab-grown#68836
Sizes 5–9, half sizes18K gold · 3.09 ct princess center · lab-grown · #68836
A princess-cut center of 3.09 carats, lab-grown, G color and VS2 clarity, prong set in an 18K gold engagement set with natural round side diamonds in F to G color and VS clarity. A princess cut is a...
3.11 ct round center · lab-grown#69143
Sizes 5–7½, half sizesSizes 5 to 7.5, half sizes18K gold · 3.11 ct round center · lab-grown · #69143
Lab-grown diamonds, center and sides: a 3.11-carat round center in E color and VS1 clarity, prong set in 18K gold, with 4.67 carats of lab-grown round side diamonds in F to G color and VS clarity....
lab-grown#68286
Sizes 5–10, half sizes14K gold · lab-grown · #68286
A Ring that will add elegance and charm to your ensemble. Wear these for an unforgettable look. It is made in 14K gold, 3.5 grams.
3 ct pear center · lab-grown#70946
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct pear center · lab-grown · #70946
This ring features a pear-shaped center stone framed by a pavé halo that curves into a bypass-style band. The pavé detailing continues along the 3/4 of the band, adding extra sparkle to the clean,...
3.01 ct oval center · lab-grown#68363
Sizes 5–8, half sizesSizes 5 to 8, half sizes18K gold · 3.01 ct oval center · lab-grown · #68363
Lab-grown center, natural sides: a 3.01-carat oval in F color and VVS2 clarity, prong set in 18K gold, with natural round side diamonds in F to G color and VS1 clarity. The sides sit close to the...
3.07 ct emerald center · lab-grown#70115
Sizes 4–10, half sizes14K gold · 3.07 ct emerald center · lab-grown · #70115
A solitaire of 3.07 carats in an emerald cut: one lab-grown diamond, E color and VS1 clarity, held in claws on 14K gold. The emerald cut shows long, flat steps instead of a scatter of sparkle, so...
3 ct oval center · lab-grown#70113
Sizes 4–9, half sizes14K gold · 3 ct oval center · lab-grown · #70113
A 3.00 carat oval lab-grown diamond, F color and VS clarity, claw set in 14K gold, with a hidden halo and 0.15 carats of smaller diamonds. A hidden halo sits under the center stone, out of view from...
New
3 ct oval center · lab-grown#71935
Made to order · Sizes 4–9, half sizesMade to order14K gold · 3 ct oval center · lab-grown · #71935
Vivienne is a 14K gold engagement ring with a 3.00 carat lab-grown oval at its center, F color and VVS clarity, and 1.30 carats of lab-grown round side diamonds, prong set. The band is 4.00 mm wide,...
How big it looks at 3 carats: a round is about 9.4 mm across, an oval about 11.5 by 8.5 mm, a cushion about 8 mm across. A listing’s own measurements settle it.
Carat size chartWhen you have it: In-stock items usually ship within 2 to 5 business days. A made-to-order ring's own page gives its ship time.
Every ring here holds a 3 carat lab-grown diamond center, some just over, most graded E to G in color and VS to VVS in clarity. The shapes are oval, cushion, emerald, marquise, pear, princess, radiant and round, set as solitaires, hidden halos, pavé bands and bridal sets, in 14K or 18K gold.
“Start with a beautiful ring on a great band, and think about the wedding bands that go with it.” Trax, at the jewelry store on 47th Street
27 rings, each with a lab-grown center of 3 to 3.6 carats. Ten say the center is IGI certified.
The 3 carat marquise in 14K sold most in the year, 61 rings. The elongated cushion Astral came next, 39.
Buyer's guide
The shape that shows 3 carats best, then the lab report, setting, gold and her size
Every ring here holds a lab-grown center of about 3 carats, so the choice that matters is the shape. A marquise or an oval spreads that weight long and looks biggest on the hand, while a round or a princess sits smaller and deeper. Most rings bought were a marquise or a cushion in 14K gold. Then check which paper comes with the center, and settle her size, because a resized ring is final.
Four picks from this page
14K Lab-Grown Marquise Engagement Ring, 3 ctSold most in the year, 61 rings: an E VS1 marquise, small round side diamonds, IGI report.
14K Astral Elongated Cushion Ring, 3 ct39 in the year: an F VVS2 cushion, its halo hidden under the stone, pavé on the shoulders.
18K Lab-Grown Oval Solitaire Ring, 3 ct24 in the year: a single F VVS oval held in prongs, on 18K yellow, white or rose gold.
14K Clara Emerald Cut Engagement Ring, 3 ct15 in the year: an F VS1 emerald cut flanked by baguette and emerald-cut side stones, IGI.
| Shape | Rings | Face-up at 3 ct | IGI report | Share bought |
|---|---|---|---|---|
| Marquise | 3 | 15 x 7.5 mm | 3 of 3 | 40 percent |
| Cushion | 5 | 9.5 x 8 mm | 2 of 5 | 25 percent |
| Oval | 6 | 11.5 x 8.5 mm | 1 of 6 | 12 percent |
| Emerald cut | 4 | 10 x 7 mm | 2 of 4 | 9 percent |
| Pear | 2 | 12.5 x 8 mm | 1 of 2 | 7 percent |
| Radiant | 2 | 9.5 x 7.5 mm | 1 of 2 | 6 percent |
| Round | 3 | 9.4 mm | none | 1 percent |
| Princess | 2 | 8 mm square | none | none |
Every count on this card is from the 27 rings live here on October 13, 2026 and what this page sold in the year to October 12, 2026; prices are on the listings. Face-up sizes follow our diamond size chart for a 3 carat stone, with the cushion taken long, and are not a measure of any one ring. Each ring's shape is the one its title names, else its center cut.
A round of 3 carats measures about 9.4 mm, a little over half as wide as the finger it sits on. Cut long, the same weight shows more, and a 3 carat marquise runs about 15 mm tip to tip.
Yes. Grown or mined, it is one carbon crystal with the same hardness and fire, and a gem lab grades both with the same letters. Only the birthplace changes. Each of these centers is lab-grown, and every title names it.
Ten of these rings say the center diamond is IGI certified, and they made up nine in ten rings bought in the year. Where a listing has no IGI line, ask us in the live chat whether a lab report comes with it.
Here it was the marquise, about four in ten rings bought in the year, then the cushion, nearly always the elongated kind. Both read long on the finger, so the 3 carats look bigger still. Marquise engagement rings.
E or F color with VS clarity or better, which is what nearly every center here carries. Every ring bought in the year had an E or F center. The three G centers read a shade warmer, most of all in white gold.
On eleven rings the listing says so. Five others set the grown center between natural side diamonds, both princess rings among them. Five more name no origin for their small stones, so ask the desk before you choose one of those.
Borrow a ring from her ring finger for an hour and take it to a jeweler, or quietly ask a friend or relative who will not tell her. All 27 rings run from 5 to 7.5 in half sizes, most from 4 to 9.
Yes, unless it was resized or made to her size, which is final. Others come back unworn and unaltered with the desk's okay, by day fourteen after delivery, on our return label. Return postage and the five percent restocking fee come off (refund policy).
Each listing prints its own price. It moves with the shape, the grades, the side diamonds and the gold. For a shape not shown here, ask in the live chat first, or call or text 212-872-9692 from 10 AM ET.
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