4 Carat Round Lab-Grown Diamond Rings, grown in light.
A large round with maximum sparkle. Each 4 carat round lab-grown diamond ring on this page is delivered with the round locked in the prongs and included in what you pay. Pick platinum or a gold shade, then a style of shank: plain and rounded, glittering with pavé near the head, or concealing a halo over pavé.
$2,847 $5,694
$2,417 $4,834
$2,417 $4,834
$2,417 $4,834
$3,167 $6,334
$2,577 $5,154
$2,577 $5,154
$2,577 $5,154
$4,107 $8,214
$3,047 $6,094
Four carats, round
A well-cut round of this weight spans a little over 10 mm and spreads across most of the finger's width. Its facets send light back up through the table, giving the brightest return of any outline. Made in a lab, a round this size sells for a modest share of a mined stone's cost.
Ways to frame a big round
- Plain solitaire: a smooth rounded shank, the most classic frame.
- Pavé shoulders: lab-grown diamond accents rise toward the head on each side.
- Hidden halo: a collar of accents under the round, seen as the hand turns.
Choosing the metal
Platinum suits a heavy center: it holds prongs firmly and stays white without any coating. White gold looks nearly identical at lower cost. Yellow and rose gold warm the ring and make the round appear whiter. Shanks run about 1.8–2.5 mm.
Wearing a four-carat round
The head sits high and meets countertops first, so remove the ring for workouts and housework. A weekly wash in warm, soapy water keeps the sparkle sharp; a jeweler's prong check twice a year keeps the round secure.
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.
