Analysis & Grading

GIA is the world’s most trusted name in diamond grading and gemstone 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 known treatments discovered during analysis. 

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Reports & Services

Diamonds

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

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Colored Diamonds

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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Synthetic Diamonds

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

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Colored Stones

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

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Pearls

Documentation of the specific attributes of pearls and pearl jewelry, including mollusk type and growth environment. 

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Unknown

Let GIA gemologists do the detective work to reveal the identity of your material.

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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

  • Email: labservice@gia.edu

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 gemology.

Expertise

GIA laboratories are staffed by expert scientists and gemologists working with state-of-the-art technology.

Precision

Advanced instrumentation and experienced visual observations deliver consistently accurate results.

Objectivity

All gemstones are analyzed under complete client anonymity to ensure objective analysis.

Integrity

As a non-profit organization, 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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