3 Carat Round Lab-Grown Diamond Rings
The classic round, at a commanding size. Each round 3 carat lab-grown diamond ring on this page is sold with a 3-carat lab-grown diamond center set and included in the price. Choose a solitaire on a plain band, a solitaire with pavé shoulders, or a hidden halo design, then pick white, yellow or rose gold or platinum on the product page.
$2,385 $4,770
$1,955 $3,910
$1,955 $3,910
$1,955 $3,910
$2,705 $5,410
$2,115 $4,230
$2,115 $4,230
$2,115 $4,230
$3,645 $7,290
$2,585 $5,170
More to discover
The round brilliant at three carats
A three-carat round measures about 9.3 mm across. Its 57 or 58 facets are angled to bounce light straight back up, giving rounds the strongest fire of any cut. The circle's symmetry flatters short and long fingers and lines up neatly beside a straight band.
Solitaire, accented or haloed
- Plain solitaire: the 3ct round solitaire in its purest form, a lone stone on smooth metal.
- Pavé shoulders: a short run of accents adds light at the base of the center.
- Hidden halo: small stones circle beneath the round, seen when the hand turns.
Matching metal to the center
White gold and platinum make a bright, colorless round look even whiter. Yellow gold is a strong, classic contrast; rose gold is softer. Over decades, platinum claws hold firmest, a real advantage under three carats of weight. Bands stay between about 1.8 and 2.5 mm wide.
Everyday wear and cleaning
High-set rounds catch on blankets and pool towels, so rest the ring in a dish overnight and before swimming or hands-on chores. Scrub beneath the stone with soapy lukewarm water weekly so light can travel through it, and let a jeweler inspect the claws annually.
Ring questions, answered.
How do I choose an engagement ring?
Start with the shape she loves, then the setting style. Our gemologists can help you balance carat, cut and budget on a free video call.
Can I build my own engagement ring?
Yes — pick a setting, then a diamond, and review the finished ring before it goes to the bench.
Does the diamond price include the setting?
Diamond and setting are priced separately in the ring builder, and the total is shown before you add the ring to your bag.
How do I find my ring size?
Use our ring size guide, or order a free ring sizer — it arrives in 2–3 days.
Can I return or resize my ring?
You can return it within 30 days (a 10% restocking fee applies to resized or engraved pieces), and your first resize within 60 days of delivery is free.
Should I insure my engagement ring?
We recommend it. Every ring ships fully insured; once it is yours, a separate jewelry insurance policy covers loss, theft and accidental damage.
