3.00–3.99 Carat Octagon Lab-Grown Diamonds
Octagon lab-grown diamonds from 3.00 to 3.99 carats, IGI certified. Widen the filters on the left to see more.
10,000+ IGI/GIA certified · Same-day shipping before 6 PM ET · No MOQ · NY + LA · Trade approval same business day before 4 PM ET
| Stock# | Status | loc | shape | carat | color | clarity | lab | Certificate | p/ct | total | measurements | ratio | Image | Video | Growth type | flour | cut | polish | symmetry | depth | table |
|---|
How big is a 3 carat Octagon?
The In stock Octagon diamonds between 3.00 and 3.99 carats in stock face up at 8.5–12.1 × 6.1–8.5 mm. Shapes and cuts carry their weight differently, so compare by mm, not only by carat.
| Carat | Typical face-up size | Diamonds measured |
|---|---|---|
| 1 ct | 6.0 × 5.9 mm | In stock |
| 2 ct | 7.6 × 7.5 mm | In stock |
| 3 ct | 9.3 × 8.1 mm | In stock |
| 4 ct | 9.5 × 9.4 mm | In stock |
3.00–3.99 carat in other shapes
3 carat Octagon lab-grown diamonds, wholesale
IGI-certified 3.00–3.99 carat Octagon lab-grown diamonds in New York and Los Angeles, colors D–F. Each has its own page with the 360° video and IGI report.
Trade questions
How fast do you ship?
Orders placed before 6 PM ET ship the same day from New York. International delivery takes 3–4 business days.
Is every diamond certified?
Yes. Each diamond on this page has an IGI or GIA report. Open the diamond page to see the report number and verify it on the lab's website.
How do I see prices?
Prices are for the trade. Sign in, or open a trade account: approval is the same business day if you apply before 4 PM ET.
Do you carry natural diamonds?
Yes. Certified natural diamonds are listed separately in Natural › Certified Diamonds.