CARAT★★★★★
“Bought a 1.5ct oval over a Tuesday lunch break. Showed up Friday, FedEx Priority, fully insured. The certificate was in the box. No appointment, no theatre.”
Daniel R. · Brooklyn, NY
1.51ct oval, IGI
47 new stones today
The lab-grown diamond marketplace.
Browse, compare, and order online. Every stone is IGI- or GIA-certified, re-verified by our gemologists, and shipped insured.
100-day returns
Free FedEx label, fully insured, no questions asked.
Verified in-house
Every stone re-graded against its IGI or GIA report by our gemologists.
Free insured delivery
FedEx Priority overnight, signature required, fully covered.
Lifetime upgrade
Trade up anytime at 100% of price paid. No doubling required.
Today’s feed
Featured lab-grown stones.
RBD-0412Best value
Re-graded
Round brilliant · 1.24ct
D · VVS1 · Ideal · IGI · CVD
$2,980Ring from $4,620
OVL-0291Going fast
Re-graded
Oval · 1.52ct
E · VS1 · Ideal · IGI · HPHT
$3,460Ring from $5,210
EMR-0108GIA
Re-graded
Emerald · 2.03ct
F · VVS2 · Excellent · GIA · CVD
$4,420Ring from $6,180
RBD-0537Best value
Re-graded
Round brilliant · 1.51ct
E · VS1 · Ideal · IGI · CVD
$3,180Ring from $4,820
PER-0204IGI
Re-graded
Pear · 1.71ct
F · VS1 · Excellent · IGI · HPHT
$3,940Ring from $5,610
CSH-0163New
Re-graded
Cushion · 1.84ct
E · VVS2 · Ideal · IGI · CVD
$4,120Ring from $5,820
RBD-0709GIA
Re-graded
Round brilliant · 2.02ct
F · VS2 · Ideal · GIA · CVD
$4,780Ring from $6,540
OVL-0388Going fast
Re-graded
Oval · 2.04ct
G · VS1 · Excellent · IGI · CVD
$4,260Ring from $6,020
EMR-0241GIA
Re-graded
Emerald · 1.51ct
E · VVS1 · Excellent · GIA · CVD
$3,580Ring from $5,240
Live gemologist consult
Talk to a gemologist before you buy.
Share your screen with a non-commissioned, GIA-trained gemologist. They’ll walk you through any stone in 360° HD, zoom to 40x, and answer questions in plain English.
Available 9am–9pm ET, seven days a week.
Verified buyers
What people say.
★★★★★
“The screen-share consult was the difference. The gemologist showed me three stones at 40x and pointed out the one with the best face-up — exactly the kind of advice you can’t get from a product page.”
Priya N. · Austin, TX
1.84ct cushion, IGI
★★★★★
“Returned the first ring at day 78. Carat covered the FedEx label and the insurance. Refund hit my card three days after they got it back. The 100-day window is real.”
Marcus T. · Seattle, WA
Returned · refunded in full
Common questions
What buyers ask first.
Is a lab-grown diamond a real diamond?
Yes. Lab-grown and mined diamonds share the same crystal structure, hardness, and optical behaviour. The only difference is origin.
How does the 100-day return work?
We email a prepaid, fully insured FedEx label. Drop the package at any FedEx location within 100 days, in original unworn condition. Refund issues within 3 business days of receipt.
What does “verified in-house” mean?
Every stone is independently re-graded against its IGI or GIA report by our gemologists before it joins the feed. If a stone falls short of its certificate, it does not list.
How does the lifetime upgrade work?
At any point, return your Carat diamond and apply 100% of what you paid toward a new diamond of equal or greater value. No 2x rule. No expiration.
Are mined diamonds available?
Yes, on request. Lab-grown is where our pricing is most competitive, but mined inventory can be sourced when origin is the priority.
Does the price include the setting?
The diamond price is the loose stone. Each listing shows a “Ring from” price that bundles a basic solitaire. Final order itemizes stone, setting, and free insured shipping.