For a 3 carat lab grown diamond engagement ring, expect about $2,840 to $5,730 complete at Rare Carat. Most of the 108,638 lab grown diamonds from 2.90 to 3.10 carats in stock cost $2,240 to $4,350, and a setting from the 680 or more designs below completes the ring. Each stone shows our AI price score and a quality score out of 18. Prices checked October 21, 2026.
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Browse our full catalogue of settings designs to choose the one that suits your style
With a lab grown center, the setting is still a real share of what a 3 carat ring costs. The designs in the table cost $605 to $1,385 for the setting in 14K white gold, and most lab grown stones from 2.90 to 3.10 carats cost $2,240 to $4,350, median $2,740. Complete rings come to about $2,840 to $5,730, against about $17,200 to $51,900 with a natural 3 carat center. Outside these six, the full catalog of 691 settings runs from $480 to $5,195.
Complete 3 carat engagement ring prices by setting, October 21, 2026: the setting price plus the middle half of 2.90 to 3.10 ct center stone prices (25th to 75th percentile, all shapes)
| Setting, 14K white gold | Setting alone | Complete ring, lab grown 3 carat center | Complete ring, natural 3 carat center |
|---|---|---|---|
| Linda comfort fit solitaire | $605 | $3,130 to $3,780 | $23,200 to $40,800 |
| Marigold six prong | $690 | $3,210 to $3,870 | $23,300 to $40,900 |
| Vivian solitaire | $935 | $3,460 to $4,110 | $23,500 to $41,100 |
| Hayden curved vine | $1,075 | $3,600 to $4,250 | $23,700 to $41,300 |
| Kennedy pavé | $1,370 | $3,890 to $4,550 | $24,000 to $41,600 |
| Bellora hidden halo | $1,385 | $3,910 to $4,560 | $24,000 to $41,600 |
A three carat lab grown diamond sits at the center of every one of the 670 or more 3 carat lab grown diamond engagement ring designs on this page. You choose that stone yourself from the 106,220 that are in the 2.90 to 3.10 carat band today, 94,628 of them with 360 HD video. Across the whole band the stone opens at $1,335 once the current savings are applied, and the median is $2,753. Most of the designs are pictured with a 3 carat lab round, which starts at $1,345 and has a median of $2,826. The 3 carat lab grown engagement ring designs here are priced today with a 3 carat lab round in 14K white gold, stone included. Among them are the Linda comfort fit solitaire at $2,135, the Vivian solitaire at $2,465 and the Bellora hidden halo at $2,915. Every number on this page was taken from inventory on October 16, 2026 and is kept current.
A round of three carats spreads about 9.3 mm across the finger, a size that few jewelry stores kept in the case before lab growing made it ordinary. Every 3 carat lab diamond engagement ring on this page carries a lab stone of that weight for what a one carat natural used to cost. The table that follows prices the stone shape by shape.
Shape changes how much finger three carats covers. An oval, pear or marquise faces up bigger than a round at the same weight, so it covers more finger for the money. The pear is the lowest priced shape at this weight with a median of $2,578, the radiant is the highest at $3,444, and the round sits at $2,826 with 18,452 stones in stock. Oval has the deepest stock in the band, with 24,496 stones. Every row in the table is a slice of the same 106,220 stones, so the rows sum to the band total. Each shape name is a link to that shape's own lab ring page, and those designs appear there with a three carat stone in that outline.
October 16, 2026: every 3 carat lab grown diamond in stock (2.90 to 3.10 ct) sorted by shape, 106,220 stones at the prices charged today
| Shape | Starts at | Median | In stock |
|---|---|---|---|
| Round | $1,345 | $2,826 | 18,452 |
| Princess | $1,335 | $2,664 | 6,128 |
| Marquise | $1,980 | $2,760 | 14,151 |
| Emerald | $1,625 | $2,874 | 10,107 |
| Pear | $1,690 | $2,578 | 13,595 |
| Oval | $1,780 | $2,696 | 24,496 |
| Heart | $1,740 | $2,957 | 1,351 |
| Radiant | $1,680 | $3,444 | 6,763 |
| Asscher | $1,730 | $2,900 | 2,288 |
| Cushion | $1,415 | $2,926 | 8,889 |
| All shapes | $1,335 | $2,753 | 106,220 |
The stock on either side of the carat mark is lopsided. Below it, 6,853 stones weigh 2.90 to 2.99 carats, with a median of $2,823, and above it 99,367 weigh 3.00 to 3.10 carats, with a median of $2,744. With grade held steady on rounds at D to F and VS2 or better, the median is $2,918 for the lighter group and $2,849 for the heavier. Buying shy of three carats therefore saves nothing in lab grown, and the full weight is the better buy.
October 16, 2026: lab grown stones below and above the 3 carat mark, every shape together and rounds at a single held grade
| Band | All shapes in stock | All shapes median | Rounds at held grade, median |
|---|---|---|---|
| 2.90 to 2.99 ct | 6,853 | $2,823 | $2,918 |
| 3.00 to 3.10 ct | 99,367 | $2,744 | $2,849 |
| 2.90 to 3.10 ct | 106,220 | $2,753 |
In a three carat lab round the top colors cost more than the middle ones, though far less than the same step in natural. With clarity held at VS2 or better, 90 percent of the 3 carat lab rounds on the color ladder are D to F, and D starts at $2,395 against $1,785 for G. Hold color at D to F and VS1 opens at $2,170, VVS2 at $2,555. Since most stock sits at D to F, that grade with VS1 or better and an Excellent cut is the usual choice for a 3 carat lab diamond engagement ring, and G or H color is where to save.
Lab rounds of 2.90 to 3.10 ct: lowest price at each color with clarity at VS2 or better, 18,270 stones, and at each clarity with color at D to F, 16,568 stones
| Color | Starts at | In stock |
|---|---|---|
| D | $2,395 | 4,722 |
| E | $2,120 | 7,324 |
| F | $1,925 | 4,361 |
| G | $1,785 | 1,333 |
| H | $1,730 | 217 |
| I | $1,600 | 166 |
| J | $1,345 | 146 |
| K | $1,385 | 1 |
| All D to K | $1,345 | 18,270 |
| Clarity | Starts at | In stock |
|---|---|---|
| FL | $4,555 | 801 |
| IF | $4,555 | 884 |
| VVS1 | $3,155 | 1,935 |
| VVS2 | $2,555 | 7,438 |
| VS1 | $2,170 | 4,405 |
| VS2 | $1,925 | 944 |
| SI1 | $1,695 | 145 |
| SI2 | $1,590 | 16 |
| All FL to SI2 | $1,590 | 16,568 |
Side by side, a lab grown and a natural round of three carats are the same size and return light the same way; the difference is scarcity and price. A 3 ct G color VS1 round is priced from $1,945 lab grown and from $30,860 natural. Across every shape the band medians are $2,753 and $30,583. Only 5,671 natural stones sit in the band against 106,220 lab grown, and 4,833 of those 5,671 carry GIA reports. If you would rather see these designs priced with the natural stone, the 3 carat natural diamond engagement rings page shows them that way.
October 16, 2026: lab grown against natural, three carat rounds of 2.90 to 3.10 ct at matching grades
| Grade | Lab grown from | Natural from | Natural median |
|---|---|---|---|
| G color, VS1 | $1,945 | $30,860 | $39,494 |
| H color, SI1 | $1,405 | $17,685 | $31,300 |
| E color, VVS2 | $2,810 | $34,420 | $68,122 |
| G color, VS2 | $1,785 | $24,155 | $41,324 |
A stone this wide rides above the finger, so the setting has to carry it with some height and a secure head. We recommend a six prong or double claw head and a band of 2.2 mm or more, with a wide tapered band or a split shank to balance the width on top. Because the lab stone costs less, there is room in the budget for a heavier band and more metal. Once a lab ring of this size arrives, it is worth arranging insurance and an appraisal.
Measured across the top, a 3 carat round comes in around 9.3 to 9.4 mm. An oval runs 11.5 x 8.5 mm, a cushion 8.5 to 9 mm and an emerald cut 9.5 x 7.5 mm, so the longer outlines look bigger at the same weight. For the largest looking ring at this price, choose a 3 carat lab grown engagement ring with an oval or pear set on a slim band. Each design here is pictured with a three carat lab round in 14K white gold. You can order the same setting in yellow gold, rose gold or platinum with your chosen stone in place. Our gemologists earn no commission, are available by chat or phone, and will go through your 3 carat finalists with you on video.
Every price in the ring grid on this page is for a finished ring, stone included. The default center today is a 3 carat lab round set in 14K white gold. The table beneath this paragraph lists those ring prices. Among the first designs shown, the Linda comfort fit solitaire is the lowest at $2,135 and the Bellora hidden halo the highest at $2,915. What separates those two is the setting, and what separates this page from the natural page is the stone. Choose any other of the 106,220 lab grown diamonds in the band, and your 3 carat lab grown diamond engagement ring is repriced around that stone.
Complete 3 carat lab grown engagement ring prices as this page showed them on October 17, 2026, in 14K white gold with the center stone included
| Design | Center stone shown | Ring price today |
|---|---|---|
| The Linda comfort fit solitaire | 3 ct lab round | $2,135 |
| The Bellora hidden halo | 3 ct lab round | $2,915 |
| The Vivian solitaire | 3 ct lab round | $2,465 |
| The Hayden curved vine | 3 ct lab round | $2,605 |
| The Marigold six prong tulip | 3 ct lab round | $2,220 |
| The Marie hidden halo | 3 ct lab round | $2,320 |
The ring is sold to you by Rare Carat directly, and Rare Carat is the merchant of record on every order. The stone you pick comes from a stock of more than 2 million diamonds, natural and lab grown. Once the ring is in your hands, you have 30 days to return it free, and one resize is free in the first year. A lifetime manufacturing warranty applies to whichever setting you choose. Before anything is set, our New York staff put the diamond under a microscope and compare its inscription with the grading report. The finished ring then ships free and fully insured. PayPal Pay Later, Katapult, Affirm, Klarna and Afterpay are offered at checkout, with each plan's terms shown before you commit. Rare Carat holds a 5 out of 5 rating on both Google and Trustpilot, and on Trustpilot no jewelry brand in America is rated higher.
Stone counts and prices in the tables take in every lab grown diamond of 2.90 to 3.10 carats that Rare Carat held in stock on October 16, 2026. They are filtered the way the diamond grids are: clarity from FL to SI2, cut Good or better, graded by GIA, IGI or GCAL, with or without video, and color from D to K. That gives 106,220 lab grown stones, 94,628 of them with 360 HD video, plus 5,671 natural stones used for the comparison. All prices are what you pay today with the current savings already taken off, and each stone shows its regular price struck through. A row's starting price is its least expensive stone at any grade or weight. Finished ring prices are those this page showed on October 17, 2026, set in 14K white gold around the center stone named in each row, and the design counts come from the page itself. The color and clarity ladders and the natural comparison use rounds from the band only, since among rounds the grade rather than the shape drives the price.