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.Learn More
Assessment of authenticity and quality for diamonds in the D-to-Z color range from GIA, creator of the 4Cs.Learn More
Assessment of color origin and quality based on GIA’s color grading system for diamonds outside the D-to-Z range.Learn More
Identification of laboratory-grown diamonds, ensuring disclosure through laser inscription and distinctive reports.Learn More
Confirmation of a gemstone’s identity and characteristics through a full gemological examination.Learn More
Documentation of the specific attributes of pearls and pearl jewelry, including mollusk type and growth environment.Learn More
Let GIA gemologists do the detective work to reveal the identity of your material.Learn More
Submit your gemstone through your local jeweler.
Ship your gemstone directly to one of our laboratories.Prepare for Submission
Bring your gemstone to either of our two Hong Kong locations.Contact Us
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