GIA is the world’s most trusted name in diamond grading and gem identification. With objectivity and expertise as its hallmarks, GIA ensures the integrity and accuracy of every report it issues. GIA tests every material submitted to determine whether it is natural or not, and discloses any treatments discovered during our examination.
Assessment of authenticity and quality for diamonds in the D-to-Z colour range from GIA, creator of the 4Cs.Learn More
Assessment of colour origin and quality based on GIA’s colour grading system for diamonds outside the D-to-Z range.Learn More
Identification of laboratory-grown diamonds, ensuring disclosure through laser inscription and digital-only reports.Learn More
Confirmation of a gemstone’s identity and characteristics through a full gemmological examination.Learn More
Documentation of the specific attributes of pearls and pearl jewellery, including mollusc type and growth environment.Learn More
Let GIA's gemmologists do the detective work to reveal the identity of your material.Learn More
Submit your gemstone through your local jeweller.
Ship your gemstone directly to one of our laboratories.Prepare For Submission
Bring your gemstone to any 16 drop-off locations in 11 countries.Prepare For Submission
SUBMITTING MORE THAN 10 GEMS?
Please contact GIA directly for instructions.
GIA Customer Service: +1 800 421 7250 ext 7590 or +1 760 603 4500 ext 7590
GIA’s groundbreaking research and unbiased grading and analysis set the global standards that protect the gem-buying public. With campuses, research centers and laboratory facilities around the world, GIA is the world’s foremost authority in gemmology.
GIA laboratories are staffed by expert scientists and gemmologists working with state-of-the-art technology.
Advanced instrumentation and experienced visual observations deliver consistently accurate results.
All gemstones are analysed under complete client anonymity to ensure objective analysis.
As a non-profit organisation, GIA operates independently of commercial and private interests, political lobbies and advocacy groups.
GIA reports are the benchmark of analysis and grading, and those who buy, sell or curate the world’s most important gems rely on GIA.
Easily download grading results and PDFs of multiple reports at once.Learn More
Questions? Call +1 800 421 7250 ext 7590 or
+1 760 603 4500 ext 7590