18K Gold Elongated Cushion Lab-Grown Diamond Solitaire Engagement Ring, 3.00 ct center

Store Rating 4.82 from 729 reviews

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$3,000Usually ships in 10 to 15 business days

$3,000$4,500

18K gold75% pure gold

4.8 gramscan change slightly when sized

3.00 ct Cushioncenter stone · Lab-grown

2.3mm wideband width

Color: Yellow

Ring size: 4

Which size?

Find your ring size in a minute

Your screen becomes the sizer. Set it with a bank card, then measure the finger you will wear the ring on, with a ring that already fits that finger or with a strip of paper.

1. Set the screen with a card

Lay any bank, debit or ID card flat on the screen, standing tall, so its short edge runs across the box, and move the slider until the box is exactly as wide as the card. No bank card? A driver's license, metro card, gift card or hotel key is the same size. Without any card the circle and the ruler are not to scale: measure your paper strip with a real ruler and set that number in millimeters on the strip slider, then send it to the desk.

2. Measure

Take a ring that fits the same finger of the same hand the new ring will live on; every finger is its own size. Set it on the screen over the circle and move the slider until the circle just fills the inside of the ring.

Size 7, 17.3 mm inside

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.

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
4.5	15.3 mm	48.0 mm	77
5	15.7 mm	49.3 mm	158
5.5	16.1 mm	50.6 mm	158
6	16.5 mm	51.9 mm	163
6.5	16.9 mm	53.1 mm	163
7	17.3 mm	54.4 mm	159
7.5	17.7 mm	55.7 mm	154
8	18.1 mm	57.0 mm	152
8.5	18.5 mm	58.2 mm	111
9	18.9 mm	59.5 mm	101
9.5	19.4 mm	60.8 mm	20
10	19.8 mm	62.1 mm	18
10.5	20.2 mm	63.3 mm	1
11	20.6 mm	64.6 mm	1
11.5	21.0 mm	65.9 mm	0
12	21.4 mm	67.2 mm	0
12.5	21.8 mm	68.5 mm	0
13	22.2 mm	69.7 mm	0
13.5	22.6 mm	71.0 mm	0
14	23.0 mm	72.3 mm	0
14.5	23.4 mm	73.6 mm	0
15	23.8 mm	74.8 mm	0
15.5	24.2 mm	76.1 mm	0
16	24.6 mm	77.4 mm	0

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.

Another metal, karat or size, or an engraving? Ask a jeweler before you buy. Custom work and resized rings are final sale.

Item #68640

$3,000$4,500size 4

Usually ships in 10 to 15 business days · ask a jeweler for today's timing · International shipping from $150

Usually ships in 10 to 15 business daysask a jeweler for today's timing

Free insured shipping in the USInternational from $150 · every order insured in transit

Ask a jeweler

Ask in the chat on this page, or call or text 212-872-9692 (a person answers from 10 AM ET)

Other ways to pay

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Bank wire3% off the price

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Sold by	TraxNYC · 64 W 47th St, New York, NY 10036 · since 2004
Returns	14 days on insured labels · 5% restocking · $50 US return shipping
In the box	Certified appraisal included
Checkout	Secure checkout on Shopify

About this item

Real 18K Gold all the way through. 18 karat is 75% pure gold mixed with harder metals. A certified appraisal comes in the box.
3.00 ct Cushion center stone, E color, VS2 clarity. Lab-grown. The store's appraisal lists the stone's weight, grade and color.
4.8 grams. The weight can change slightly when the ring is sized; text a jeweler for the exact weight.
2.3 mm band width.
Sizes offered: 4 to 9, half sizes. "Which size?" under the size pills opens the store's ring sizer. A size not listed: Ask a jeweler before you buy.
Listed for women. Sold and shipped by TraxNYC, 64 W 47th St, New York, in business since 2004. Secondhand Dealer License 2123575-DCWP.

Add the wedding band

This ring$3,000

18K Gold Leaf Diamond Eternity Ring$1,900

Total: $3,000 + $1,900

Pick a size above to add both

18K Gold Diamond Wedding Band$1,350

18K Gold Diamond Wedding Band (Lab)$1,200

18K Gold Diamond Wedding Band$1,350

18K Gold Lab-Grown Diamond Wedding Band$1,850

Item specifics

Metal18K Gold75% pure gold

Width2.3 mmband width

Weight4.8 gramscan change slightly when sized

The ring

Center stoneCushion

Center stone weight3.00 ct

Center stone colorE

Center stone clarityVS2

Center stone originLab-grown

StyleCushion Cut Engagement Rings

Setting styleSolitaire

Sizes offered4 to 9, half sizes

SettingProng

ForWomen

Item number68640

Ratingstore 4.82 (729)

Price$3,000

Delivery & returns

ShippingFree insured US shipping on this piece

Ships inUsually ships in 10 to 15 business days

Internationalfrom $150

AppraisalCertified appraisal included

Returns14 days on insured labels · 5% restocking · $50 US return shipping

Pay your way

AcceptedAffirmBank wire −3%Crypto · ask a jewelerShop PayApple PayGoogle PayPayPalVisaMastercardAmex

Sold by

TraxNYC64 W 47th St, New York, NY 10036

Phone212-872-9692 · a person answers from 10 AM ET

LicenseSecondhand Dealer License 2123575-DCWP

Description

Crafted in 18K gold, this engagement ring features a stunning 3 carat elongated cushion lab-grown diamond. The elongated cushion cut blends the classic charm of a cushion diamond with a refined, elongated silhouette, delivering exceptional brilliance, a larger face-up appearance, and an elegant finger-lengthening effect.

Designed with a secure gallery rail for added durability and everyday wear, this elegant setting also sits flush with most wedding bands for a seamless bridal stack. The sleek 18K gold band enhances the diamond's beauty while maintaining a clean, sophisticated profile.

Our lab-grown diamond offers the same sparkle, durability, and beauty as a mined diamond, making it a sustainable and ethical choice. Perfect for proposals, anniversaries, and life's most meaningful moments, this elongated cushion engagement ring is designed to be cherished for a lifetime.

Questions & answers

Is this your best price?

The price on this page is the price of the piece. Have a number in mind? Tap Make an offer and send it; the desk answers with what it can do. Paying by bank wire takes 3% off.

What is the center stone?

Center stone: 3.00 ct Cushion, lab-grown, E color, VS2 clarity. Lab-grown diamonds are real diamonds, grown in a lab instead of mined. Anything not shown here: Ask a jeweler.

Can I get it in another metal, with an engraving or another change?

The metals, colors and sizes this ring comes in are the choices above. Anything else (another karat, a different stone, an engraving, another size) is a custom order: Ask a jeweler with the item number and what you want; they say yes or no and quote it. Custom and personalized work is final sale.

What if the size is wrong? Can I return it?

Pick your size above; "Which size?" opens the store's ring sizer. A size we do not list, or a quarter size: Ask a jeweler before you buy. The weight can change slightly when the ring is sized; text a jeweler for the exact weight. Resizing is custom work and a resized ring cannot be returned. An unworn ring in its listed size can come back within 14 calendar days of delivery, on our label, less the 5% restocking fee and return shipping.

Does it come with a lab report?

This ring does not list a lab report. It ships with the store's appraisal, which lists the carat and gram weights and the diamond grade and color. A lab report for one stone before you buy: Ask a jeweler.

What if it is lost or stolen in the mail?

Every package is insured by us while it travels. Once FedEx marks it delivered, loss or theft is covered only if you add Optional Shipping Insurance at checkout.

What metal is it?

Real 18K Gold: 18 karat is 75% pure gold, alloyed with harder metals for strength.

Does it come with an appraisal or a certificate?

Every gold order ships with the store's appraisal: carat and gram weights, diamond grade and color, market value and the corporate seal. International orders get a digital appraisal.

How fast does it ship, and can I return it?

Every order ships insured from 47th Street. Usually ships in 10 to 15 business days. Returns: 14 calendar days from confirmed delivery, new and unworn, in the original packaging, on a label TraxNYC issues; an approved return carries a 5% restocking fee and $50 return shipping in the continental US ($100 international), and the original shipping is not refunded. Resizing is custom work, and a resized ring cannot be returned. Shipping policy · Refund policy

Have another question? Ask in the chat on this page, or call or text 212-872-9692 (a person answers from 10 AM ET).