Skip to content

WORLD GEMOLOGICALInstitute™

Our story
Our mission
The laboratory
Our gemologists
WGI worldwide
Join WGI

Official Graders

Lab-Grown Diamonds

What are lab-grown diamonds?
How they are created
Lab-grown vs natural
The 4Cs
Why grading matters

Diamond Grading Report
Lab-Grown Diamond Report
Jewellery Grading Report
Gemstone Identification Report
Pearl Grading Report
Natural vs Synthetic Verification
All services
Find an Official Grader

Diamond Grading & the 4Cs
Lab-Grown Diamond Technology
Natural vs Synthetic Gemstones
How to Read a WGI Report
Jewellery Terminology
Caring for Fine Jewellery
Knowledge Centre

Verify Certificate Contact

Thank you

Your payment was received. Credits will appear in your account within a minute.

View my credits

WORLD GEMOLOGICALInstitute™

An international gemological institute providing identification, grading and certification of diamonds, gemstones, pearls and jewellery, from its laboratory in London's Hatton Garden.

London · info@wgi-global.com
New York · ny@wgi-global.com
Ramat Gan · israel@wgi-global.com

Institute

About WGI
The laboratory
Lab-Grown Diamonds
Contact

Services

All services
Diamond Grading
Jewellery Reports
Gemstone Identification

Knowledge

Knowledge Centre
The 4Cs
Reading a WGI report
FAQ

Professionals

Verify Certificate
Official Graders
Join WGI
Login

© 2026 World Gemological Institute™London · New York · Ramat Gan