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 color range from GIA, creator of the 4Cs.
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Assessment of color origin and quality based on GIA’s color grading system for diamonds outside the D-to-Z range.
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Identification of synthetic diamonds, ensuring disclosure through laser inscription and distinctive reports.
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Confirmation of a gemstone’s identity and characteristics through a full gemological examination.
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Documentation of the specific attributes of pearls and pearl jewelry, including mollusk type and growth environment.
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Let GIA gemologists do the detective work to reveal the identity of your material.
Learn MoreSubmit your gemstone through your local jeweler.
Bring your gemstone to any 16 drop-off locations in 11 countries.
Prepare For SubmissionSUBMITTING 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 gemology.
GIA laboratories are staffed by expert scientists and gemologists working with state-of-the-art technology.
Advanced instrumentation and experienced visual observations deliver consistently accurate results.
All gemstones are analyzed under complete client anonymity to ensure objective analysis.
As a non-profit organization, 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.
Use GIA’s free online tool to estimate a cut grade.
Questions? Call +1 800 421 7250 ext 7590 or
+1 760 603 4500 ext 7590
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