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.

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Reports & Services


Assessment of authenticity and quality for diamonds in the D-to-Z coluor range from GIA, creator of the 4Cs. 

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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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Synthetic diamonds

Identification of synthetic diamonds, ensuring disclosure through laser inscription and distinctive reports.  

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Coloured stones

Confirmation of a gemstone’s identity and characteristics through a full gemmological examination.

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Documentation of the specific attributes of pearls and pearl jewellery, including mollusc type and growth environment. 

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Let GIA's gemmologists do the detective work to reveal the identity of your material.

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3 ways to submit a gemstone to GIA


Please contact GIA directly for instructions.

  • GIA Customer Service: +1 800 421 7250 ext 7590 or +1 760 603 4500 ext 7590

  • Email:


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. 

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. 

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