Certificates & guarantee
Certified, insured, and yours with confidence
Every Carat Lab diamond arrives with proof of exactly what it is — independently graded and certified by IGI, laser-inscribed, fully insured in transit and backed by our guarantee.
Independent certification
Certified by IGI
Every Carat Lab diamond is graded by the International Gemological Institute (IGI), one of the world's leading independent gemological laboratories. Each stone is assessed on the 4Cs and laser-inscribed with a unique number that matches its certificate — so you can verify exactly what you own.
- An independent IGI report — graded by the institute, not by us.
- A laser-inscribed ID — a microscopic number on the girdle that matches your certificate.
- Verifiable by you — check the report number against IGI's public database.
The 4Cs
Graded on the 4Cs
Every IGI report grades your diamond across the four characteristics that define its quality and beauty. Here is what each one means — and why it matters.
Cut
The precision that creates fire and brilliance.
Colour
Graded across the D–L scale of whiteness.
Clarity
How clean the diamond is under magnification.
Carat
The weight of the stone, measured in carats.
In every delivery
What comes with your diamond
Each piece is presented complete — proof, provenance and protection in one box.
Grading certificate
The independent report detailing your diamond's 4Cs.
Traceability card
Your stone's origin and production journey.
Premium gift box
Presentation packaging, ready to gift.
Care instructions
How to keep your piece brilliant for years.
Our guarantee
A lifetime warranty on craftsmanship.
Getting it to you
Shipped safely, anywhere
We partner with trusted global couriers so your order arrives secure and on time.
Insured worldwide shipping
Sent with trusted couriers (DHL, FedEx, UPS) and fully insured against loss or damage.
Full tracking
A tracking number and real-time updates from our atelier to your door.
Discreet packaging
No external branding, for privacy and added security in transit.
Our guarantee
Lifetime warranty
On the craftsmanship of every piece we make.
30-day returns
Return or exchange within 30 days (terms apply).
Help, around the clock
Customer care for resizing, cleaning or any question.
Honest pricing
Customs & import duties
Our diamonds ship directly from our atelier, so the prices you see exclude local import duties and taxes. These are set by your country and paid on delivery — which is exactly why our prices stay this honest. Here is a guide for our main markets:
| Destination | Typical charge on import | Collected by |
|---|---|---|
| United States | Often duty-free under the de minimis threshold; sales tax may apply | Carrier on delivery |
| Germany | 19% VAT + a small import duty | Carrier / customs |
| United Kingdom | 20% VAT + a handling fee on import | Carrier / customs |
Duties and taxes are payable directly to the carrier or customs authority in your country, not to Carat Lab.
Buy with total confidence
Certified, laser-inscribed and insured — every Carat Lab diamond is backed end to end. Explore the collection or learn how lab-grown compares.