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GIA

How GIA Grades and Analyses Gemstones

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How GIA Grades and Analyses Gemstones

GIA Delivers Results You Can Trust

GIA's ground-breaking research and unbiased grading and analysis set the global standards that protect the gem-buying public. With campuses, research centres, and laboratory facilities around the world, GIA is the world's foremost authority in gemmology.

How GIA Grades and Analyses Gemstones

  • 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 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.

Reports and Services

Natural Diamonds

Natural Diamonds

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

Natural Colored Diamonds

Natural Colored Diamonds

Assessment of color origin and quality based on GIA's color grading system for diamonds outside the D-to-Z range.

Laboratory-Grown Diamonds

Laboratory-Grown Diamonds

Identification of laboratory-grown diamonds, ensuring disclosure through laser inscription and digital-only reports.

Pearls

Pearls

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

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