1 Carat Diamond Engagement Rings

22 rings 4.8

4.8 (912 reviews) · the jewelry store on 47th Street

Results

1 ct marquise diamond ring with gold band and round diamond accents.

Best seller

^$1,250

14K Gold Marquise Lab-Grown Diamond Engagement Ring 1 CT 71336

1 ct marquise center · lab-grown#71336

Made to order · Sizes 4–9, half sizesMade to order

14K yellow gold marquise lab-grown diamond split shank engagement ring, top view

^$1,250

14K Gold Marquise Lab-Grown Diamond Split Shank Engagement Ring 71882

1 ct marquise center · lab-grown#71882

Made to order · Sizes 5–9, half sizesMade to order

Round diamond engagement ring in yellow gold – four-prong solitaire with round accent stones along the band

from ^$18,950· size 4.5

14K Gold Classic Round Engagement Diamond Ring 65076

1.25 ct round center · natural#65076

Sizes 4½–9, half sizes

Yellow gold engagement ring with princess cut diamond center and twisted diamond-accented band.

Best seller

^$1,350

14K Gold Princess Cut Lab-Grown Diamond Engagement Ring 71575

1 ct princess center · lab-grown#71575

Sizes 5–9, half sizes

Yellow gold ring with marquise-cut diamond and hidden halo of smaller diamonds on band.

Best seller

^$1,550

14K Gold Marquise Hidden Halo Lab-Grown Diamond Ring 71048

1.3 ct marquise center · lab-grown#71048

Made to order · Sizes 4–9, half sizesMade to order

Pear cut 1 carat diamond engagement ring in a three-prong setting with round accent stones on the band

Best seller

^$1,250

14K Gold 1 Ct Mirabella Pear Lab-Grown Diamond Engagement Ring 71608

1 ct pear center · lab-grown#71608

Sizes 4–9, half sizes

Custom Made Skull Diamond Engagement Ring 68536 - Image 1

^$5,150

14K Gold Custom Made Skull Lab-Grown Diamond Engagement Ring 68536

1.21 ct round center · lab-grown#68536

Sizes 5–10, half sizes

Radiant Cut Diamond Engagement Ring 68658 - Image 1

from ^$4,400· size 5

14K Gold Radiant Cut Lab-Grown Diamond Engagement Ring 68658

1.09 ct radiant center · lab-grown#68658

Sizes 5–8, half sizesSizes 5 to 8, half sizes

Prong Diamond Engagement Ring 41455 - Image 1

from ^$13,050· size 5

14K Gold Prong Diamond Engagement Ring 41455

1.1 ct round center · natural#41455

Sizes 5–9, half sizes

Engagement ring set with a round prong-set center stone and fitted band

from ^$12,400· size 5

Prong Diamond Engagement Ring Set 44600

14K gold1.03 ct round center · natural#44600

Sizes 5–9, half sizes

White gold ring with heart-shaped diamond center and diamond-accented band.

Best seller

^$1,200

14K Gold Heart Lab-Grown Diamond Ring 70846

1 ct heart center · lab-grown#70846

Made to order · Sizes 5–8, half sizesMade to orderSizes 5 to 8, half sizes

from ^$14,200· size 5

14K White Gold Diamond Engagement Ring 66139

1.14 ct round center · natural#66139

Sizes 5–8½, half sizesSizes 5 to 8.5, half sizes

Custom diamond engagement ring with round center stone in yellow gold-tone setting – front-face angle

^$9,150

18K Gold Custom Diamond Engagement Ring 64502

1.01 ct round center · natural#64502

Size 6.25Size 6.25

Prong Diamond Engagement Halo Ring 57040 - Image 1

from ^$6,450· size 4.5

14K Gold Prong Diamond Engagement Halo Ring 57040

1 ct round center · natural#57040

Sizes 4½–6½, half sizesSizes 4.5 to 6.5, half sizes

Engagement Diamond Ring (Lab) 68779 - Image 1

from ^$3,750· size 5

14K Gold Engagement Diamond Ring (Lab) 68779

1.34 ct round center · lab-grown#68779

Sizes 5–9, half sizes

Custom Made Diamond Engagment Ring 67469 - Image 1

^$10,300

14K Gold Custom Made Diamond Engagment Ring 67469

1 ct center · natural#67469

Sizes 5–9, half sizes

Platinum Engagement Ring Set 68941 - Image 1

from ^$5,600· size 4

Platinum Lab-Grown Diamond Engagement Ring Set 68941

1.03 ct round center · lab-grown#68941

Sizes 4–7, half sizesSizes 4 to 7, half sizes

from ^$11,600· size 5

14K Gold Diamond Engagement Ring 68917

1 ct round center · natural#68917

Sizes 5–10, half sizes

Signature Oval Diamond Engagement Ring in 18K gold

from ^$15,200· size 5

18K Gold Signature Oval Diamond Engagement Ring 68837

1.2 ct oval center · natural#68837

Sizes 5–9, half sizes

Marquise halo diamond engagement ring in yellow gold – front view showing elongated center stone and round brilliant halo

^$15,400

Marquise Halo Diamond Engagement Ring 43566

1.16 ct marquise center · natural#43566

Sizes 5–9½, half sizes

from ^$15,200· size 4

18K Gold Diamond Engagement Ring 67497

1.3 ct baguette center · natural#67497

Sizes 4–9, half sizes

14K yellow gold Demi Princess engagement ring with a 1.50 ct natural princess-cut diamond in four claw prongs, front view

^$10,500

14K Gold Demi Princess 1.50 Ct Natural Diamond Engagement Ring 70676

1.5 ct princess center · natural#70676

Made to order · Sizes 4–9, half sizesMade to order

See all 210 diamond engagement rings for women ›

Every ring here holds a center diamond of 1 carat or a little more, up to about 1.3 carats. The centers are round, marquise, pear, oval, princess, radiant and heart; some are lab-grown diamonds, and each listing names where its center came from. A few sit in halos and hidden halos, and a few are bridal sets sold with their band.

“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

20 rings, each center 1 carat or a little over. Nearly every ring bought here in the year was lab-grown.

The 1 carat lab-grown marquise sold most, 39 in the year, and every ring bought here was 14K.

Buyer's guide

How to choose a 1 carat engagement ring

Shape first, then grown or mined, then the center carat and her ring size

Pick the shape before anything else, because at one carat it decides how big the stone looks. A marquise, pear or oval faces up longer and larger than a round, and most rings bought here in the year were marquise. Then choose grown or mined. Both are real diamonds, and here the grown centers carry the higher grades. Read the center carat, not the total, and set it in 14K for daily wear.

Four picks from this page

14K Gold Marquise Lab-Grown Diamond Engagement Ring 1 CT 71336

14K Marquise Lab-Grown Engagement Ring, 1 ct39 in the year, the most here: an E VS1 lab-grown marquise on prongs, about 2 grams.

14K Gold Marquise Hidden Halo Lab-Grown Diamond Ring 71048

14K Marquise Hidden Halo Lab-Grown Ring, 1.30 ct31 in the year, second here: F VVS, small diamonds under the marquise, a 1.4 mm pave band.

14K Gold Heart Lab-Grown Diamond Ring 70846

14K Heart Lab-Grown Diamond Ring, 1 ct18 in the year: a 1 carat E VS heart on a band of small diamonds, white or yellow gold.

14K Gold Classic Round Engagement Diamond Ring 65076

14K Classic Round Engagement Ring, 1.25 ctOne of the two mined rings bought here in the year: an F VS1 round on four prongs.

Shape: which diamond shape looks biggest at 1 carat

A marquise looks biggest at one carat, then a pear and an oval, because their weight runs into length. A one-carat marquise faces up about 10.5 by 5 mm. A round of the same weight is about 6.5 mm across, and the table sets out every shape. Buyers here leaned toward length, and marquise rings made up most of what sold in the year. Round is on half the listings and stays the classic, and a princess faces up smallest. The points of a marquise or pear chip first, so check that a prong covers each tip.

Lab or mined: lab-grown vs natural 1 carat diamonds

Grown and mined are both diamond, judged on one scale, and at this size the grown ones here carry the higher grades. Every grown center is D, E or F color and VS or cleaner. About half the mined centers print SI clarity, which usually looks clean once set but should be seen first. Nearly every ring bought here in the year had a grown center. A mined stone is the one the earth made, and some buyers want exactly that. For more grown centers, see the lab-grown engagement rings.

Carat: 1 carat center vs total carat weight

Read the center carat and set the total aside. Every center here weighs from 1 carat to 1.34, and seven sit at exactly 1. Total carat weight adds the small stones, and on six rings those outweigh the center. Skip the chase for a decimal, since a center a third heavier sits only about a tenth wider. Two listings name an IGI report, so for any other ring ask us whether a report backs the center. For a bigger look, step up to 2 carat engagement rings.

Setting and gold: plain band, hidden halo or halo, in 14K

A slim band makes a one-carat center look bigger, and the rings bought most here in the year are light, about 2 grams of gold. The hidden halo, small diamonds tucked under the center and seen only from the side, sold second most in the year. Two rings wear a full halo, which reads a size larger, and two come as sets with their band. Take 14K. It is harder than 18K, every ring bought here in the year was 14K, and most come in white or yellow. Choose her wedding band at the same time so the two sit flush.

Her size: 1 carat engagement ring sizes and resizing

Have one of her own rings from that finger measured, and tell us which hand. Most rings here offer each half size, 5 through 8. Four run all the way from 4 to 9, and one comes in a single size, 6.25. The ring size chart shows how to read a ring at home. Settle the size before checkout, since the refund policy makes any resized ring final sale. For a size a listing lacks, ask in the live chat first, or call or text 212-872-9692 from 10 AM ET.

By shape: the 1 carat centers here, how big each shape faces up, grown or mined, and what sold

Center shape	Rings	Grown or mined	Face at 1 ct	Sold, past year
Marquise	3	2 grown, 1 mined	10.5 x 5 mm	70
Heart	1	Grown	6.5 x 6.5 mm	18
Pear	1	Grown	8.5 x 5.5 mm	6
Round	10	3 grown, 7 mined	6.5 mm across	3
Princess	1	Grown	5.5 mm square	3
Radiant	1	Grown	6.5 x 5.5 mm	1
Oval	1	Mined	8 x 6 mm	0
Other or unstated	2	Mined	Ask us	0

Every count on this card is from the 20 rings live here on October 13, 2026 and what this page sold in the year to October 12, 2026; prices are on the listings. The millimeters are the usual face-up size of each shape at one carat, not a measurement of each ring. Grown or mined is the center stone as each listing names it.

Questions we get in the store

How big is a 1 carat diamond on the hand?

A round one is close to 6.5 mm wide. The same weight cut as a marquise runs about 10.5 by 5 mm, so it looks larger on the finger. A princess faces up smallest, near 5.5 mm a side.

Lab-grown or natural for a 1 carat engagement ring?

Both are real diamonds, and 99 of the 101 rings bought here in the year had a grown center. At this size the grown centers here grade D to F and VS or cleaner, while about half the mined ones print SI clarity.

Does 1 carat mean the center stone or the whole ring?

The center stone. Every center here weighs 1 carat to 1.34. Total carat weight adds the small stones as well, and on six rings those stones together outweigh the center, so compare two rings by the center carat alone.

What color and clarity should a 1 carat diamond have?

G and whiter reads white in a setting, and SI1 or cleaner usually hides its marks from the eye. All but one graded center here is G or whiter. On a mined SI1 or SI2, ask us what shows.

Plain band, halo or hidden halo for a 1 carat center?

A hidden halo if she wants more sparkle with a clean top view, since its small stones sit under the center. A full halo makes the center read a size larger. The hidden halo marquise sold second most here in the year.

14K, 18K or platinum for a 1 carat engagement ring?

14K suits a ring worn every day, being harder than 18K, and all the rings bought here in the year were 14K. Three rings here are 18K, a richer yellow that marks sooner, and one platinum set stays white on its own.

How do I get her ring size right and keep the proposal a surprise?

Slip one of her rings off the ring finger and have a jeweler read it, or ask a friend or relative who can keep a secret. Note which hand it came from. Of these 20, 17 come in every half size, 5 to 8.

Can I return a 1 carat engagement ring?

Yes, if it comes back unworn and unaltered within fourteen days of reaching you. Message the live chat first, then send it on the return label we issue. Five percent for restocking and that label come off what we refund. Resized rings are final.

Shop by style

One Carat in the Center, Up to About 1.3

Want a 1 carat center in a shape or setting not shown here? Start a custom engagement ring on the ring builder, and we will be in touch about it.

How big is 1 carat? A 1 carat round is about 6.5 mm across. At 1 carat an oval is about 8 by 6 mm and a marquise about 10.5 by 5 mm, so both look bigger than the round; the diamond size chart shows every shape. Step up to 2 carat engagement rings or 3 carat engagement rings, or see every engagement ring for women and all lab-grown diamond engagement rings.

1 carat engagement rings at a glance

Center: 1 carat to about 1.3 carats.
Shapes: round, marquise, pear, oval, princess, radiant and heart.
Center diamonds: some lab-grown; each listing names the center's origin.
Grades, where the listing gives them: most D to G color.
Reports: a few centers come with an IGI report, named on the listing.
Metal: most 14K gold, a few 18K and platinum; most offered in white or yellow gold.
Sizes: all in half sizes.
Made to order: nearly all are made in her size after you order; the ring's own page gives its ship time.

Questions about 1 carat diamond rings

Does 1 carat mean the center or the whole ring? On this page it is the center stone. Total carat weight adds every stone, so a halo raises it without changing the center; read the center carat on the listing.

Which shape looks biggest at 1 carat? The marquise and the oval: at 1 carat both look bigger than a 6.5 mm round.

How do I find her size? Each listing gives its ring sizes, and the ring size chart shows how to measure at home.

Questions about a ring? Start a live chat on this page, or call or text 212-872-9692; a person answers from 10 AM ET.

Visit our showroom on 47th Street: text or call first, and a jeweler tells you what the store has that day. Every stone is shown in person or on video before you decide.

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