4 Carat Diamond Ring: How Big It Looks, What a 4 Carat Lab-Grown Diamond Costs and How It Compares With 3 and 5

Oval lab-grown diamond on a wide flat band engagement ring in 14k white gold, a setting that balances a 4 carat stone

A 4 carat round diamond is about 10.2 mm across and 6.3 mm deep, weighs 0.8 grams, covers 62 percent of a size 6 finger and shows two and a half times the face of a 1 carat. It is the size most people arrive at after trying a 5 carat and flinching, and in lab-grown it costs less than a 1 carat natural averages: on October 23, 2026 a 4 carat diamond of D to G color and IF to VS2 clarity started at $2,082 in our picker for an emerald cut, $2,133 for an oval and $2,195 for a round, 799 of the 5,889 four-carat stones in the picker that day were under $3,000, and with our 14k solitaire at $950 a finished 4 carat ring starts at $3,032. A natural 4 carat averages $73,765 on StoneAlgo's live index, more than thirty times the price of our least expensive stone. The question, as at every weight above 3 carats, is the hand rather than the wallet: 10.2 mm of diamond is 2 mm wider than a 2 carat and 0.8 mm narrower than a 5, and this guide is about where that lands on a real finger. It gives the size of a 4 carat diamond in millimeters for every shape we set and what each covers on a size 5 to size 8 finger, the lab-grown prices by shape, color and clarity against the natural market, what a complete 4 carat ring costs in each of our settings, how 4 carats compares with 3 and with 5, which settings carry it, how it wears, and how to choose one. Our carat size chart covers every weight from half a carat up, the 3 carat guide explains where most people stop, and the 5 carat guide takes the next step.

Oval lab-grown diamond on a wide flat band engagement ring in 14k white gold, angled view
Round lab-grown diamond solitaire engagement ring in 14k white gold, seen from the front
Emerald cut lab-grown diamond three stone engagement ring in 14k white gold with emerald cut side stones, seen from the front
Three settings that suit a 4 carat, all in 14k white gold and priced without the stone: the wide flat band ($1,500), whose 3 mm of metal balances a 13 mm oval; the solitaire ($950), whose four claw prongs are made to the stone; and the three stone with matching emerald cut sides ($1,850), which spreads a step cut's calm across the finger.

4 carat diamond ring at a glance

Question Short answer
How big it is A round is about 10.2 mm across and 6.3 mm deep; an oval about 12.9 by 9.1 mm, an emerald cut 10.8 by 7.6, a radiant 11.2 by 7.9, a pear 14.3 by 9.0, a marquise 16.7 by 8.5; 4 carats is 0.8 grams
On the hand A 10.2 mm round covers 65% of a size 5 finger, 62% of a size 6, 59% of a size 7 and 56% of a size 8; it shows 2.5 times the face of a 1 carat, 1.2 times a 3 carat, and 85% of a 5 carat
Lab-grown price From $2,082 (emerald cut), $2,133 (oval) and $2,195 (round) in our picker on October 23, 2026, D to G and IF to VS2; 799 of the 5,889 stones between 4.00 and 4.49 carats were under $3,000 and 1,521 under $4,000
Natural price $73,765 on average, from $23,089 to $175,117 across 4,193 live listings (StoneAlgo, October 23, 2026)
Complete ring at Clairamor From $3,032 with a 4 carat emerald cut in the 14k solitaire, $3,145 with a round; $3,245 in the hidden halo, $3,645 in the pavé band, $4,045 in the Art Deco
Against 3 and 5 carats 0.8 mm wider and 0.6 mm taller than a 3 carat round for about $560 more; 0.8 mm narrower and 0.5 mm lower than a 5 carat for about $520 less; the step people notice least in width and most in height
The setting Four claw prongs made to the stone, six on the tulip cathedral for a round, or a full bezel; a hidden halo braces the head; a 2.8 to 3 mm band balances the width without the sizing allowance a wider band needs
Who it suits A broad hand, a size 6.5 or 7, and a life that is not hard on the hands; on a size 5 finger it reads as a 5 carat does on a size 7

How big is a 4 carat diamond?

A carat is 0.2 grams, so a 4 carat diamond is 0.8 grams of stone, and for a well-cut round the weight and the width track closely: the cheapest of the 1,379 rounds between 4.00 and 4.49 carats in our picker on October 23, 2026, a 4.02 carat G VVS2, measured 10.16 by 10.19 mm and 6.31 mm deep, and the stones around the middle of the price range measured 10.2 mm across and 6.3 mm deep. The width sits exactly between the two weights people compare it with: a 3 carat round is 9.3 mm and a 5 carat 11.0, so a 4 carat is 9 percent wider than a 3 carat with 19 percent more face, and 8 percent narrower than a 5 carat with 15 percent less. Against the common sizes the step is larger: 26 percent wider than a 2 carat with 58 percent more face, and 58 percent wider than a 1 carat with two and a half times its face. Weight grows with the cube of the width and face with its square, which is why the carats climb faster than the millimeters and why, past 3 carats, each extra carat adds less than a millimeter.

1 ct
6.4 mm
2 ct
8.1 mm
3 ct
9.3 mm
4 ct
10.2 mm
5 ct
11.0 mm
Size 6 finger
16.5 mm across
Round diamonds from 1 to 5 carats drawn to the same scale, next to the width of a size 6 finger. Screens differ, so this is a comparison, not a ruler: the 4 carat is 9% wider than the 3 carat and 8% narrower than the 5, and it covers 62% of the finger.

The fancy shapes spread 0.8 grams differently, and the table gives the measurements of the stones around the middle of each shape's price range in our picker on October 23, ranked the way our diamond shapes guide ranks the shapes for face-up size. The depth column is the one to read twice, because at 4 carats a round is 6.3 mm deep before its setting while an emerald cut of the same weight is 5.1 and a marquise 5.2, and that millimeter is the difference between a ring that catches a sleeve and one that does not.

Shape, 4.00 to 4.49 carats Typical length x width Typical depth Width across a size 6 finger Looks, carat for carat
Marquise 16.7 x 8.5 mm 5.2 mm 52%, and as long as a size 6 finger is wide Largest; the longest line on the finger
Pear 14.3 x 9.0 mm 5.5 mm 55% Large; long with a wide body
Oval 12.9 x 9.1 mm 5.7 mm 55% Large; about a tenth more face than a round
Moval 14.9 x 8.2 mm 5.1 mm 50% Large; long and slim, and the lowest of the brilliants
Dutch marquise 16.0 x 8.0 mm 5.3 mm 48% As long as a marquise, with straight sides
Radiant 11.2 x 7.9 mm 5.3 mm 48% About a round, elongated
Round 10.2 x 10.2 mm 6.3 mm 62% The reference, and the tallest
Cushion (elongated) 10.8 x 8.6 mm 5.7 mm 52% A little smaller than a round; cut deep
Emerald cut 10.8 x 7.6 mm 5.1 mm 46% Smallest for the weight, and the lowest; much of it below the girdle

4 carats against 3 and 5

Most people who look at a 4 carat are deciding between three weights, so the table puts the three side by side, each the least expensive round of its weight in our picker on October 23, 2026, with the width, the depth, the face relative to the 4 carat, the share of a size 6 finger and the finished price in our 14k solitaire. Read it and the pattern is plain: the step from 3 to 4 carats adds 0.8 mm of width and 0.6 mm of height for about $560, the step from 4 to 5 adds another 0.8 mm of width and 0.5 mm of height for about $520, and neither step is the one you notice most, which is the step from 2 to 3. A 4 carat is the compromise that is not really one: it looks nearly as large as a 5 carat from across a table, since it shows 85 percent of the face, and it stands half a millimeter lower, which is the difference most hands feel. Our lab-grown diamond price guide has the full ladder from half a carat up.

Round, October 23, 2026 3 carats 4 carats 5 carats
Width 9.3 mm 10.2 mm 11.0 mm
Depth, table to point 5.7 mm 6.3 mm 6.8 mm
Face, against the 4 carat 84% 100% 117%
Share of a size 6 finger 56% 62% 67%
Least expensive stone, D to G, IF to VS2 $1,632 (3.15 ct G VS1) $2,195 (4.02 ct G VVS2) $2,711 (5.01 ct G VVS2)
Price per carat $518 $546 $541
With the 14k solitaire ($950) $2,582 $3,145 $3,661
Natural average, StoneAlgo $40,976 $73,765 $117,065

How much is a 4 carat lab-grown diamond?

Less than a 1 carat natural, and the reason is the way the two are priced: a natural 4 carat is rare and costs many times a 1 carat's price per carat, while a lab-grown 4 carat is a crystal that spent longer in the chamber and costs about the same per carat as a 1 carat, $546 against $640 on the day. The table is our picker on October 23, 2026, every stone D to G in color, IF to VS2 in clarity and Ideal to Very Good in cut, with its IGI, GIA or HRD report, a video and its measurements, filtered the way the storefront filters by default. The 4 carat shelf is the deepest of the large weights: 5,889 stones between 4.00 and 4.49 carats across the nine shapes, against 2,002 at 5 carats, with 799 under $3,000 and 1,521 under $4,000, and at this weight the oval outnumbers the round. The lab-grown diamond price guide covers every weight and explains why these prices have been falling.

Shape Stones at 4.00 to 4.49 ct Least expensive Under $3,000 Under $4,000
Emerald cut 962 $2,082 (4.02 ct G VS1 Ideal, 10.9 x 7.4 mm) 89 188
Oval 1,432 $2,133 (4.01 ct G VVS2 Excellent, 12.8 x 8.7 mm) 316 407
Round 1,379 $2,195 (4.02 ct G VVS2 Excellent, 10.2 mm) 142 227
Radiant 968 $2,246 (4.01 ct G VVS2 Ideal, 11.2 x 8.1 mm) 128 290
Pear 328 $2,279 (4.07 ct G VS1 Ideal, 14.2 x 9.1 mm) 68 141
Marquise 274 $2,412 (4.06 ct G VVS2 Ideal, 16.8 x 8.2 mm) 32 164
Cushion (elongated) 479 $2,428 (4.08 ct G VVS2 Ideal, 11.6 x 8.4 mm) 24 90
Dutch marquise 24 $3,134 (4.11 ct E VVS2 Excellent, 15.7 x 7.8 mm) 0 4
Moval 43 $3,398 (4.06 ct G VVS2 Excellent, 15.3 x 8.2 mm) 0 10

Color and clarity move the price more at 4 carats than at 1, because big colorless stones are scarcer in the feed, but less than at 5. Among the 4 carat rounds the least expensive G was $2,195, the least expensive F $2,414, E $2,432 and D $2,913; the cheapest IF of any color was $6,496 and the cheapest D IF $6,857. Ovals ran G $2,133, F $2,488, E $2,514 and D $2,935, with an IF from $7,140, and emerald cuts G $2,082, F $2,116, E $2,296 and D $2,388, a $306 spread from G to D that makes the emerald cut the shape to buy in D. The lesson across all three is that at 4 carats the step from G to F or E costs between $30 and $400 depending on the shape and the step to D between $300 and $800, while IF clarity doubles or triples the price for a difference no one can see; VS1 and VVS2, the cheapest clarity grades on the day, are where the value sits. Our color scale and clarity chart explain what each grade shows on the hand, and every setting we make in each shape is gathered in its collection: round, oval, emerald cut, radiant, pear, marquise, elongated cushion, moval and Dutch marquise engagement rings.

How much is a natural 4 carat diamond?

StoneAlgo's live index of natural listings put the average 4 carat at $73,765 on October 23, 2026, across 4,193 stones, with a range from $23,089 to $175,117; by shape the averages ran $67,473 for a round, $79,302 for an oval, $70,170 for an emerald cut, $68,513 for a cushion, $64,437 for a radiant, $96,899 for a pear and $86,904 for a marquise, and the index had fallen 5.2 percent over the previous six months. Against our least expensive 4 carat round at $2,195 the natural average is 34 times the price, and the gap widens at the top grades, because a D or an IF is a rarity in a mined stone and a production choice in a grown one. Neither is an investment, since both resell for a fraction of their price, and our lab-grown vs natural guide explains what is the same, what is different and why the prices diverge. The practical consequence for a 4 carat is the one that runs through this guide: the money that a natural stone would absorb goes instead to the setting, the color grade and the band, and the decision becomes a question of proportion rather than of budget.

What a complete 4 carat diamond ring costs

Every Clairamor setting is priced without the center stone, so the finished ring is the setting plus the stone you choose, with nothing added between them. The table adds the least expensive 4 carat emerald cut, oval and round in our picker on October 23, 2026 to the settings a large stone most often goes into, all in 14k gold; 18k adds $100 to $400 to the setting and platinum $100 more again on most designs, as the 14k vs 18k guide tabulates, and the price calculator adds any stone in the picker to any setting on the day you use it. Read across any row and the stone is 53 to 70 percent of the finished price; read down and the whole spread of settings, from the plainest solitaire to the Art Deco, is $900.

Setting, 14k gold Setting alone With a 4 ct emerald cut ($2,082) With a 4 ct oval ($2,133) With a 4 ct round ($2,195)
Solitaire, four claw prongs $950 $3,032 $3,083 $3,145
Bezel, full rim $950 $3,032 $3,083 $3,145
Low profile $950 $3,032 $3,083 $3,145
Cathedral, and the six-prong tulip cathedral for a round $1,000 $3,082 $3,133 $3,195
Hidden halo $1,050 $3,132 $3,183 $3,245
Three stone, side stones included $1,350 $3,432 $3,483 $3,545
Pavé band $1,450 $3,532 $3,583 $3,645
Wide flat band, 3 mm $1,500 $3,582 $3,633 $3,695
Art Deco, channel-set baguettes $1,850 $3,932 $3,983 $4,045

Which settings suit a 4 carat diamond

Every head we make is built to the stone you choose, so the claws of a 4 carat's prongs are cut thicker and longer than a 1 carat's and the basket wider, and no design we make is off limits for it; the choice is about how the weight is held, how high it sits and how the band balances it. The standard head holds a 4 carat in four claw prongs made to the stone and shows the most of it; the tulip cathedral ($1,000) gives a round six petal prongs, the cautious choice; a full bezel ($950) wraps the girdle in metal and makes the stone read a millimeter larger; and the hidden halo ($1,050) braces the prongs with a diamond rail and makes a feature of the 6.3 mm the stone stands before the setting. The band is where 4 carats differs usefully from 5. A 10.2 mm stone on our standard 2 mm band is a proportion most people like, the classic big-stone solitaire, where an 11 mm stone starts to want more metal; if you prefer balance, the rounded tapered band ($1,400), about 2.8 mm at the shoulders, and the 3 mm wide flat band ($1,500) give it without the quarter or half size allowance a 4 to 6 mm band needs. Height is the other difference: a 4 carat round is 6.3 mm deep, so it sits half a millimeter lower than a 5 carat in the same head and the cathedral's arches are a reasonable choice again, though an emerald cut or moval at 5.1 mm is still the way to carry 4 carats lowest. The solitaire, bezel, hidden halo, tulip, cathedral and wide band collections show each design in every shape and metal, and the platinum collection gathers the rings in the metal whose prongs wear slowest.

Is a 4 carat diamond too big? The hand test

A ring's size is the inside diameter of the band and, near enough, the width of the finger it fits: a size 5 is 15.7 mm across, a size 6 16.5, a size 7 17.3 and a size 8 18.1. A 10.2 mm round covers 65 percent of a size 5 finger, 62 percent of a size 6, 59 percent of a size 7 and 56 percent of a size 8, which is to say that a 4 carat on a size 5 hand looks the way a 5 carat does on a size 7, and the elongated shapes cover less across the finger and more along it: a 4 carat oval is 9.1 mm wide, 55 percent of a size 6, but 12.9 mm long, and a marquise at 16.7 mm is as long as a size 6 finger is wide. Our standing advice, from the 3 carat guide, holds: if you have a broad hand, a size 6.5 or 7, and a life that is not hard on your hands, 4 carats can be right, and at these prices it is worth seeing on your own size in the size simulator beside a 3 and a 5. On a slim size 4 or 5 hand it is a statement; on a short finger a round or an elongated cushion carries the weight better than a marquise or pear, which will run the finger's length.

Ring size Finger width 4 ct round, 10.2 mm 4 ct oval, 9.1 mm wide 4 ct emerald cut, 7.6 mm wide 5 ct round, 11.0 mm, for comparison
5 15.7 mm 65% 58% 48% 70%
6 16.5 mm 62% 55% 46% 67%
7 17.3 mm 59% 52% 44% 64%
8 18.1 mm 56% 50% 42% 61%

Color, clarity, cut and wear at 4 carats

A 4 carat shows its color more than a 1 carat, because the tint is seen through a body 10 mm across and more than 6 deep, so F or better is worth its price, which at 4 carats is small: $219 from G to F on a round and $34 on an emerald cut on October 23. Clarity does not scale with the stone, since an inclusion stays the size it is while the facets around it multiply, so VS1 or VS2 is eye-clean in a 4 carat brilliant and VVS2 remains the grade for an emerald cut, whose open table hides nothing. Cut sets depth and depth is height, so between two stones of the same grade take the shallower; and the least expensive 4 carat round on the day was an Excellent cut at $2,195, so the top cut grades cost nothing extra at this weight. On the finger the ring wears like a 3 carat with a little more to protect: the prongs, made to the stone, take the knocks the diamond shrugs off, so have them checked whenever the ring is cleaned, which our maintenance program covers up to four times a year; insure the ring for what it would cost to replace, which is the picker price plus the setting, with the appraisal every Clairamor ring comes with; and take it off for the gym, the garden and any work with tools or ropes. Our 4Cs guide, certification page and care guide cover the grades, the reports and the routine.

How to choose a 4 carat diamond ring

Five checks. First, the hand: measure the ring size, read the coverage table, and put a 3, a 4 and a 5 carat on your own size in the simulator, because the three look more alike on a screen than on a finger. Second, the shape: a round for the classic and the tallest profile, an oval for the most face and the deepest shelf of 4 carat stones, an emerald cut for the lowest profile and the lowest price, a marquise or pear if the finger is long enough to carry 14 to 17 mm. Third, the grades: F or better, VS1 or VS2 in a brilliant and VVS2 in an emerald cut, the shallower of two cuts. Fourth, the setting: four claws made to the stone, six on the tulip cathedral for a round, a bezel for protection, a hidden halo to brace the head, and the 2 mm standard band or a 3 mm band for balance. Fifth, the budget, which the tables settle: $3,032 to $4,045 complete in 14k gold with the least expensive 4 carat of each shape, $200 to $800 more for the color grade you want, and about a twentieth of what the natural stone alone would average. If the hand test says no, the 3 carat guide is where most people land; if it says yes and you are still curious, the 5 carat guide is the next step.

Where Clairamor fits

Every setting we make is built for the stone you choose from our picker, and the picker is where a 4 carat ring starts: filter by shape and carat, compare the measurements and the depth, watch the video, and the price you see is the price of the stone, added to the setting at the price shown. We stock D to G color and IF to VS2 clarity only, every stone with an IGI, GIA or HRD report, and on October 23, 2026 the picker held 5,889 stones between 4.00 and 4.49 carats, from $2,082. Every ring is made to order in about three weeks, ships free in the US with 30-day returns, carries a lifetime warranty against manufacturing defects and comes with an appraisal for insurance and one complimentary resize within 100 days for clients in the USA. Take it off for the gym, the garden and any work with tools or ropes, and have the prongs checked when it is cleaned.

Torn between 3 and 4 carats, or between 4 and 5? Book a design consultation.

Frequently asked questions

How big is a 4 carat diamond?

A 4 carat round is about 10.2 mm across and 6.3 mm deep, 9 percent wider than a 3 carat and 8 percent narrower than a 5. The fancy shapes run longer: a 4 carat oval is about 12.9 by 9.1 mm, an emerald cut 10.8 by 7.6, a pear 14.3 by 9.0 and a marquise 16.7 by 8.5, from the stones in Clairamor's picker on October 23, 2026.

How much is a 4 carat diamond ring?

Lab-grown, from $3,032 at Clairamor on October 23, 2026: the 14k solitaire at $950 with the least expensive 4 carat emerald cut at $2,082; a round made it $3,145 and the Art Deco setting $4,045. A natural 4 carat averaged $73,765 for the stone alone on StoneAlgo's index that day, so a natural ring of the same size costs more than twenty times as much.

How much is a 4 carat lab-grown diamond?

On October 23, 2026 a 4 carat lab-grown diamond of D to G color and IF to VS2 clarity started at $2,082 for an emerald cut, $2,133 for an oval and $2,195 for a round in Clairamor's picker, and 799 of the 5,889 stones between 4.00 and 4.49 carats were under $3,000. A D color round started at $2,913 and a D IF at $6,857.

How much is a natural 4 carat diamond worth?

StoneAlgo's index of 4,193 live listings averaged $73,765 on October 23, 2026, from $23,089 to $175,117; rounds averaged $67,473, ovals $79,302 and pears $96,899, and the index had fallen 5.2 percent in six months. Resale is a fraction of those figures, so neither a natural nor a lab-grown 4 carat is an investment; the money is spent on the wearing.

Is 4 carats too big for a ring?

Not on a broad hand. A 10.2 mm round covers 65 percent of a size 5 finger, 62 percent of a size 6 and 56 percent of a size 8, and stands 6.3 mm tall before the setting, half a millimeter lower than a 5 carat. On a size 6.5 or 7 hand it can be right; on a slim size 4 or 5 hand it is a statement.

How does a 4 carat diamond compare with a 3 carat and a 5 carat?

A 4 carat round is 10.2 mm across against 9.3 for a 3 carat and 11.0 for a 5, with 19 percent more face than the 3 and 15 percent less than the 5, and it stands 6.3 mm deep against 5.7 and 6.8. In lab-grown the steps cost about $560 and $520: $1,632, $2,195 and $2,711 for the least expensive rounds in Clairamor's picker on October 23, 2026.

Which shape looks biggest at 4 carats?

The marquise, at about 16.7 by 8.5 mm, then the pear at 14.3 by 9.0 and the oval at 12.9 by 9.1, which shows about a tenth more face than a 10.2 mm round. The radiant is about a round, the elongated cushion a little smaller, and the emerald cut, at 10.8 by 7.6 mm, the smallest and lowest for the weight, with much of it below the girdle.

What is the best setting for a 4 carat diamond?

One made to the stone. Clairamor's standard head holds a 4 carat in four claw prongs cut to its size, the tulip cathedral gives a round six, a full bezel wraps the girdle, and a hidden halo braces the prongs with a diamond rail. A 10.2 mm stone sits well on the standard 2 mm band, and a 3 mm band balances it with no sizing allowance.

Does a 4 carat diamond look secure in a four-prong setting?

Yes, when the prongs are made to the stone, which at Clairamor they are: the claws on a 4 carat are cut thicker and longer than on a 1 carat and the basket is wider. Six prongs, on the tulip cathedral for a round, add a margin, and a full bezel wraps the girdle entirely. Whatever holds it, have the prongs checked whenever the ring is cleaned.

What color and clarity should a 4 carat diamond be?

F or better in color, because a 10 mm stone shows its tint more than a 1 carat does, and the step is small, $219 from G to F on a round on October 23, 2026. VS1 or VS2 is eye-clean in a 4 carat brilliant, since inclusions do not grow with the stone; an emerald cut wants VVS2. IF doubles the price for a difference no one can see.

How many carats is a $10,000 engagement ring?

In lab-grown, far more than 4: on October 23, 2026 a 4 carat round in Clairamor's Art Deco setting was $4,045 complete and a 10.09 carat F VS1 round was $5,993 for the stone alone. In natural diamonds, $10,000 buys the stone alone at between 1 and 2 carats, since a natural 1 carat round averages about $4,700 and a 2 carat about $20,000.

How much does a 4 carat diamond weigh and how tall does it sit?

0.8 grams, since a carat is 0.2 grams. A 4 carat round is about 6.3 mm deep from table to point, against 5.7 mm for a 3 carat and 6.8 for a 5, so it stands 0.6 mm taller than a 3 carat in the same head. A 4 carat emerald cut or moval is about 5.1 mm deep and sits lower, as does any shape in a bezel.

Related reading

About the author

Cameron Malakan is the owner of Clairamor and a third-generation jeweler. He writes Clairamor's Diamond Education guides. Read Clairamor's story.