Analysis & grading
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.
Reports & Services
Natural Diamonds
Assessment of authenticity and quality for diamonds in the D-to-Z colour range from GIA, creator of the 4Cs.
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Natural Coloured Diamonds
Assessment of colour origin and quality based on GIA’s colour grading system for diamonds outside the D-to-Z range.
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Identification of laboratory-grown diamonds, ensuring disclosure through laser inscription and digital-only reports.
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Coloured stones
Confirmation of a gemstone’s identity and characteristics through a full gemmological examination.
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Pearls
Documentation of the specific attributes of pearls and pearl jewellery, including mollusc type and growth environment.
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Unknown
Let GIA's gemmologists do the detective work to reveal the identity of your material.
Learn More3 ways to submit a gemstone to GIA
Submit your gemstone through your local jeweller.
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 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.
Expertise
GIA laboratories are staffed by expert scientists and gemmologists working with state-of-the-art technology.
Precision
Advanced instrumentation and experienced visual observations deliver consistently accurate results.
Objectivity
All gemstones are analysed under complete client anonymity to ensure objective analysis.
Integrity
As a non-profit organisation, GIA operates independently of commercial and private interests, political lobbies and advocacy groups.
Global standard
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
- 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?
- 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?
Resources
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Lab Return Dates
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Analysis & Grading Fees
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GIA Locations
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Lab Alerts
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