Start with the shape she already wears, then choose the center stone, grown or mined. Both are real diamonds, and most buyers here take lab-grown, which carries the big centers. Look at two carats and up, the size about half the buyers here chose. Get her size right before you order, because a resized ring cannot come back. Take 14K for a ring she never takes off.
Find your ring size in a minute
Size 7: 17.3 mm across, 54.4 mm around. It is the most bought size here: 21 percent of the engagement rings sold here in the past year with a size recorded. 159 of the 174 rings here list size 7.
Between two sizes? Take the one that passes the knuckle and sits snug below it. A wide band, 8 mm and up, fits tighter, so go up a half size. Measure at the end of the day, at room temperature.
Text this size to the desk
The engagement ring size chart, 4 to 16
| US size | Inside diameter | Around the finger | Rings here listing it |
|---|
| 4 | 14.9 mm | 46.8 mm | 73 |
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| 4.5 | 15.3 mm | 48.0 mm | 77 |
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| 5 | 15.7 mm | 49.3 mm | 158 |
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| 5.5 | 16.1 mm | 50.6 mm | 158 |
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| 6 | 16.5 mm | 51.9 mm | 163 |
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| 6.5 | 16.9 mm | 53.1 mm | 163 |
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| 7 | 17.3 mm | 54.4 mm | 159 |
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| 7.5 | 17.7 mm | 55.7 mm | 154 |
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| 8 | 18.1 mm | 57.0 mm | 152 |
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| 8.5 | 18.5 mm | 58.2 mm | 111 |
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| 9 | 18.9 mm | 59.5 mm | 101 |
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| 9.5 | 19.4 mm | 60.8 mm | 20 |
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| 10 | 19.8 mm | 62.1 mm | 18 |
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| 10.5 | 20.2 mm | 63.3 mm | 1 |
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| 11 | 20.6 mm | 64.6 mm | 1 |
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| 11.5 | 21.0 mm | 65.9 mm | 0 |
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| 12 | 21.4 mm | 67.2 mm | 0 |
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| 12.5 | 21.8 mm | 68.5 mm | 0 |
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| 13 | 22.2 mm | 69.7 mm | 0 |
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| 13.5 | 22.6 mm | 71.0 mm | 0 |
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| 14 | 23.0 mm | 72.3 mm | 0 |
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| 14.5 | 23.4 mm | 73.6 mm | 0 |
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| 15 | 23.8 mm | 74.8 mm | 0 |
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| 15.5 | 24.2 mm | 76.1 mm | 0 |
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| 16 | 24.6 mm | 77.4 mm | 0 |
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A screen measurement set with a card is a guide, good to about a half size; the desk sizes you right the first time. "Rings here listing it" counts the live listings on October 2, 2026; the sales lines are engagement rings sold here in the year to September 26, 2026, with a size recorded.
Shapes: which engagement ring shape to buy
Buy the shape she already wears in her other rings. More than half the rings bought here were marquise, most of them one design in four center sizes. Round is on the most listings and sits compact. Oval, marquise and pear carry their weight in length, so they look larger than a round of the same carat. A marquise or pear has points that chip first, so look for a prong over each tip.
Lab or natural: lab-grown vs natural diamond engagement rings
Both are real diamonds, graded on the same letters; one is grown, the other dug from the ground. Most buyers here chose lab-grown, and the grown centers run bigger: the middle one is 2.50 carats, a mined one about a carat. Neither is the wrong buy. Where a listing leaves the origin out, ask the desk which it is and what report backs the center. Lab-grown engagement rings have a page of their own.
Carat and grades: how many carats, and what color and clarity mean
About half the buyers here chose a center of two carats or more, and 2 carat engagement rings and 3 carat diamond rings each have a page. Read the center carat, not the total weight, which adds in the side stones. A one-carat round is about 6.5 mm across. D, E and F look colorless, and G through J read white once set. VS and better look clean to the naked eye; on an SI stone, ask the desk what shows. Cut, the fourth C, is in the four Cs article.
Setting and metal: solitaire, halo or hidden halo, in 14K, 18K or platinum
A solitaire, one stone on a plain band, is the setting named most here, and prongs hold nearly every center. A halo rings the center with small stones so it reads larger; a hidden halo sits under the center, seen only from the side. Have a jeweler check the prong tips every year or so. Take 14K for every day, as most buyers here did; 18K is a richer yellow that marks sooner, and platinum stays white. Pick her wedding band at the same time, or start from the wedding ring sets.
Size: how to find her ring size without asking
Measure a ring she wears on her ring finger, and tell the desk which hand. The ring sizer on this page reads any ring. If you must guess, 7 is the size bought most here, and nearly a third of the sized rings sold were half sizes, so measure to the half. Get it right before you order: the refund policy lists ring resizing as custom work, and custom work is final. For a size the listing lacks, open the live chat first; the desk picks up 212-872-9692 from 10 AM ET.
Questions we get in the store
What shape engagement ring should I buy?
Buy the shape she already wears. More than half the rings bought here were marquise, and round is on the most listings. Oval, marquise and pear look larger than a round of the same carat.
Lab-grown or natural diamond for an engagement ring?
Either one is a real diamond, and most buyers here chose lab-grown. The grown centers here run bigger, while a mined one sits nearer a carat. Ask the desk which report a center carries.
How much should an engagement ring cost?
Each listing prints its own price. The center stone sets most of it: carat, shape, color, clarity, and grown or mined. The setting adds the gold by grams and karat, or platinum, and the side stones. For a ring or size not listed, start in the live chat; calls and texts to 212-872-9692 are answered from 10 AM ET.
More questions we get
How many carats should an engagement ring be?
About half the buyers here chose two carats or more. Read the center carat, not the total weight, which counts the side stones as well. A one-carat round measures about 6.5 mm across the top.
How do I find her ring size without asking?
Borrow a ring she wears on her ring finger and have it measured, or lay it on the ring sizer on this page. Say which hand it came from. Guessing, start at 7, the size bought most.
What do the color and clarity grades mean?
Color says how white the stone is, and clarity how clean it looks under a loupe. D, E and F look colorless. VS and better look clean to the eye, while SI2 often does not. Most centers here that state a grade are that clean.
14K, 18K or platinum for an engagement ring?
Take 14K for every day. Most buyers chose it, and it is harder than 18K. Choose 18K for a richer yellow, knowing it marks sooner. Platinum stays white on its own and weighs the most on the hand.
Can an engagement ring be resized?
It depends on the band: stones all the way round often rule it out. Ask the desk before you order, since the refund policy counts resizing as custom work and a resized ring cannot come back.
Can I return an engagement ring, and how fast does it ship?
Yes, from the case, unless its listing says non-returnable: new and unworn, inside 14 days of delivery, on the return label the desk issues; its cost and 5 percent restocking are kept. Made to order, resized or custom is final. Case rings usually ship in 2 to 5 business days, and a made-to-order ring can take 2 to 3 weeks: ask the desk which yours is.