Most complete 4 carat lab grown diamond engagement rings at Rare Carat cost about $3,500 to $7,660, setting included. The center is one of 54,820 lab grown diamonds from 3.90 to 4.10 carats, which mostly cost $2,900 to $6,280, set in any of the 680 or more designs below. Our AI price score and a quality score out of 18 come with every stone. Prices checked October 21, 2026.
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Browse our full catalogue of settings designs to choose the one that suits your style
Each ring here is a setting plus a center you pick. Settings in the table cost $605 to $1,385 in 14K white gold, and most lab grown stones from 3.90 to 4.10 carats cost $2,900 to $6,280, with a median of $3,660. Most complete rings come to about $3,500 to $7,660; with a natural 4 carat center they come to about $29,000 to $96,900. Beyond the six designs shown, the full catalog of 691 settings runs from $480 to $5,195.
Complete 4 carat engagement ring prices by setting, October 21, 2026: the setting price plus the middle half of 3.90 to 4.10 ct center stone prices (25th to 75th percentile, all shapes)
| Setting, 14K white gold | Setting alone | Complete ring, lab grown 4 carat center | Complete ring, natural 4 carat center |
|---|---|---|---|
| Linda comfort fit solitaire | $605 | $3,960 to $4,860 | $38,600 to $73,000 |
| Marigold six prong | $690 | $4,050 to $4,940 | $38,700 to $73,000 |
| Vivian solitaire | $935 | $4,290 to $5,190 | $39,000 to $73,300 |
| Hayden curved vine | $1,075 | $4,430 to $5,330 | $39,100 to $73,400 |
| Kennedy pavé | $1,370 | $4,730 to $5,620 | $39,400 to $73,700 |
| Bellora hidden halo | $1,385 | $4,740 to $5,640 | $39,400 to $73,700 |
The diamond in a 4 carat lab grown diamond engagement ring here starts at $1,780 with today's savings applied, and the median stone is $3,668. That diamond is one you pick from 55,883 lab grown diamonds in stock today between 3.90 and 4.10 carats, 50,157 of them with 360 HD video, and it goes into one of 670 or more designs. Most of the 4 carat designs are pictured with a 4 carat lab round, which starts at $1,800 in this band and has a median of $4,027. Pictured today with a 4.01 carat lab round in 14K white gold, the Linda comfort fit solitaire comes to $2,530, the Vivian solitaire to $2,860 and the Bellora hidden halo to $3,310, with the stone included. The stone figures were taken from inventory on October 16, 2026 and move as stock changes.
At lab grown prices, four carats is a size people can afford rather than only imagine, and the round center of a 4 carat lab grown engagement ring measures about 10.3 mm across, wider than most ring fingers are tall. Every price on this page includes a four carat lab stone in the ring, and the table below breaks that stone's cost out by shape.
At the medians you pay $3,513 for an oval at this weight and $4,027 for a round, so the oval is the least expensive shape in the table and the round the most expensive. The oval is also the shape with the most stock, 12,559 stones, while rounds number 11,874 with that $4,027 median. The rows of this table divide up the 55,883 stones in the band, which is why they add back up to the headline count. Because an oval, pear or marquise faces up larger than a round of the same weight, a 4 carat stone in one of those shapes covers more finger and costs less. Clicking a shape takes you to its own lab ring page, where these same designs appear with a four carat stone of that shape.
55,883 lab grown diamonds from 3.90 to 4.10 ct, sorted by shape, at today's prices after savings (October 16, 2026)
| Shape | Starts at | Median | In stock |
|---|---|---|---|
| Round | $1,800 | $4,027 | 11,874 |
| Princess | $2,075 | $3,529 | 1,885 |
| Marquise | $2,520 | $3,791 | 3,764 |
| Emerald | $2,020 | $3,959 | 7,938 |
| Pear | $2,135 | $3,607 | 2,619 |
| Oval | $1,900 | $3,513 | 12,559 |
| Heart | $2,535 | $3,727 | 677 |
| Radiant | $1,995 | $3,685 | 6,750 |
| Asscher | $2,155 | $3,620 | 1,953 |
| Cushion | $1,780 | $3,678 | 5,864 |
| All shapes | $1,780 | $3,668 | 55,883 |
Stopping short of the carat mark saves $592 on a round once grade is held steady at D to F and VS2 or better, since those rounds have a median of $3,490 from 3.90 to 3.99 carats against $4,082 from 4.00 to 4.10. No one can see that difference in diameter, and in lab grown the dollars involved are small, so most buyers go ahead and take the round number. Counting every shape, the lighter side of the band holds 5,199 stones with a median of $3,775 and the heavier side holds 50,684 stones with a median of $3,659.
Lab stones on either side of 4 carats: every shape, then rounds alone at one held grade (October 16, 2026)
| Band | All shapes in stock | All shapes median | Rounds at held grade, median |
|---|---|---|---|
| 3.90 to 3.99 ct | 5,199 | $3,775 | $3,490 |
| 4.00 to 4.10 ct | 50,684 | $3,659 | $4,082 |
| 3.90 to 4.10 ct | 55,883 | $3,668 |
With clarity held at VS2 or better, a D color round starts at $3,425 while a G starts at $2,330, and 95 percent of the 4 carat lab rounds on that color ladder sit at D to F. With color held at D to F, a VS1 starts at $2,975 and a VVS2 at $3,355. The step from G to D is real money here, but a small fraction of the same step in natural, so a 4 carat lab diamond engagement ring is still usually set with a D to F, VS1 or better stone and an Excellent cut. G or H is the place to save for the setting or the weight.
Lowest price of a four carat lab round (3.90 to 4.10 ct) at each color grade with clarity VS2 or better (11,794 stones), and at each clarity grade with color D to F (11,238 stones)
| Color | Starts at | In stock |
|---|---|---|
| D | $3,425 | 2,747 |
| E | $2,900 | 5,495 |
| F | $2,595 | 2,930 |
| G | $2,330 | 475 |
| H | $2,000 | 118 |
| I | $2,090 | 10 |
| J | $2,305 | 19 |
| K | n/a | 0 |
| All D to K | $2,000 | 11,794 |
| Clarity | Starts at | In stock |
|---|---|---|
| FL | $6,390 | 422 |
| IF | $5,480 | 487 |
| VVS1 | $4,330 | 1,002 |
| VVS2 | $3,355 | 5,935 |
| VS1 | $2,975 | 2,814 |
| VS2 | $2,595 | 512 |
| SI1 | $2,030 | 62 |
| SI2 | $1,800 | 4 |
| All FL to SI2 | $1,800 | 11,238 |
A 4 ct round in G color and VS1 clarity begins at $2,555 as a lab stone and at $46,945 as a natural one, and across every shape the two band medians are $3,668 and $52,325. The natural band holds 1,668 stones against 55,883 lab, so the natural stone is the scarce one, and 1,391 of those 1,668 natural stones come with GIA reports. In size and in sparkle the lab stone matches the natural one for a fraction of the price. If you would rather see these designs priced with natural stones, the 4 carat natural diamond engagement rings page shows them that way.
Lab against natural: 4 carat rounds (3.90 to 4.10 ct) at matching grades, October 16, 2026
| Grade | Lab grown from | Natural from | Natural median |
|---|---|---|---|
| G color, VS1 | $2,555 | $46,945 | $60,181 |
| H color, SI1 | $2,000 | $44,305 | $53,871 |
| E color, VVS2 | $3,745 | $113,805 | $160,519 |
| G color, VS2 | $2,330 | $48,180 | $74,939 |
Part of what lab pricing leaves in your budget should go into metal, because at four carats the setting is doing structural work whether the stone is lab grown or natural. That means a band of 2.5 mm or wider, six or eight prongs or a full bezel, a gallery underneath to support the stone, and shoulders that stop it from turning. An elongated shape sits lower in the mounting and wears more easily than a round at this weight. Sizing matters more than usual as well, since a heavy head will roll on a band that is even a little loose, so have a lab ring of this weight sized precisely.
For the biggest looking ring at this price, choose a lab oval or pear of this weight on a slim band, since the elongated shapes read larger than a round of the same carat weight. Face up, a 4 ct round measures about 10.2 to 10.4 mm, while an oval runs 12.5 x 9.5 mm, an emerald cut 10.5 x 8 mm and a cushion 9.5 to 10 mm. Every 4 carat lab diamond engagement ring on this page is pictured with a lab round in 14K white gold, and each design is also made in yellow gold, rose gold and platinum around the stone you select. Our gemologists earn no commission on what you buy, and you can reach them by chat or phone to go over 4 ct finalists with you on video.
The first designs shown run from $2,530 for the Linda comfort fit solitaire at the low end to $3,310 for the Bellora hidden halo at the high end, and the gap between those two is entirely the setting. Each price in the table below is for a finished ring, because the grid gives every design a default center, which today is a 4.01 carat lab round in 14K white gold. This page and the natural page share the same designs and differ only in the stone. Choose a different one from the 55,883 lab grown diamonds in the band and the 4 carat lab grown diamond engagement ring is repriced around it.
Price of each 4 carat lab grown engagement ring as pictured here, 14K white gold with the center stone, October 17, 2026
| Design | Center stone shown | Ring price today |
|---|---|---|
| The Linda comfort fit solitaire | 4.01 ct lab round | $2,530 |
| The Bellora hidden halo | 4.01 ct lab round | $3,310 |
| The Vivian solitaire | 4.01 ct lab round | $2,860 |
| The Hayden curved vine | 4.01 ct lab round | $3,000 |
| The Marigold six prong tulip | 4.01 ct lab round | $2,615 |
| The Marie hidden halo | 4.01 ct lab round | $2,715 |
Whatever you decide to spend, the ring is sold to you by Rare Carat, a direct retailer and the merchant of record on every order, and any one of more than 2 million diamonds, natural and lab grown, can be set into these designs. Every setting is covered by a lifetime manufacturing warranty. Once you order, our staff in New York examine the center stone under a microscope and match its inscription to the grading report before the ring is sent out. Shipping is free and insured, returns are free for 30 days and resizing is free during the first year. Spreading the cost is possible at checkout through Afterpay, PayPal Pay Later, Katapult, Affirm or Klarna. Customers rate Rare Carat 5 out of 5 on both Google and Trustpilot, and on Trustpilot it ranks as the highest rated jewelry brand in America.
The stone counts and prices above describe every lab grown diamond from 3.90 to 4.10 carats held in Rare Carat inventory on October 16, 2026, filtered the way the diamond grids are filtered, meaning graded by GIA, IGI or GCAL, with or without video, color D to K, clarity FL to SI2 and cut Good or better. That gives 55,883 lab grown stones, of which 50,157 have 360 HD video, plus 1,668 natural stones used for comparison. A stone's price here is the amount you pay today after the current savings, and the regular price appears struck through on the stone itself. Where a row shows a starting price, it is the least expensive stone in that row at any grade or weight. Ring prices are for complete rings as they appeared on this page on October 17, 2026, in 14K white gold and with the named center stone included, and the design count is the count shown on the page. The color ladder, the clarity ladder and the same grade comparison are built from round stones within the band, so that price changes follow grade and not shape.