Analysis & gradingGIA 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.
Reports & Services
Assessment of authenticity and quality for diamonds in the D-to-Z coluor 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 synthetic diamonds, ensuring disclosure through laser inscription and distinctive 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
3 ways to submit a gemstone to GIA
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 DELIVERS RESULTS YOU CAN TRUST
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.
Frequently asked questions
- What is Report Check Plus?
- Why have you changed your Report Check log in?
- How can I verify multiple reports or download multiple report PDFs at once?
- How do I replace a lost, stolen or destroyed GIA report?
- What is GIA LabDirect?
- Which analysis and grading services are offered at each laboratory location?
- How do I pay for analysis and grading services?
- What treatments does GIA test for?
- How does GIA grade D to Z diamonds?
- How does GIA test coloured stones?
- What pearl grading system does GIA use?
- What is the GemPass Redemption Programme?
Report check plus
Easily download grading results and PDFs of multiple reports at once.Learn More
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Questions? Call +1 800 421 7250 ext 7590 orContact Us
+1 760 603 4500 ext 7590
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