Analysis & Grading

明升体育app_明升体育-官网 is the world’s most trusted name in diamond grading and gem identification. With objectivity and expertise as its hallmarks, 明升体育app_明升体育-官网 ensures the integrity and accuracy of every report it issues. 明升体育app_明升体育-官网 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

Diamond - Lab Services

Natural Diamonds

Assessment of authenticity and quality for diamonds in the D-to-Z color range from 明升体育app_明升体育-官网, creator of the 4Cs. 

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明升体育app_明升体育-官网ed Diamond - Lab Services

Natural 明升体育app_明升体育-官网ed Diamonds

Assessment of color origin and quality based on 明升体育app_明升体育-官网’s color grading system for diamonds outside the D-to-Z range.

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Reports Laboratory-Grown

Laboratory-Grown Diamonds

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

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GlobalGem_GemEncyclo-Ruby-132x74

明升体育app_明升体育-官网ed Stones

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

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GlobalGem GemEncyclo Pearl

Pearls

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

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A&G Landing Reports Unknown

Unknown

Let 明升体育app_明升体育-官网 gemologists do the detective work to reveal the identity of your material.

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3 ways to submit a gemstone to gia

FIND A JEWELER

Submit your gemstone through your local jeweler. 

Send to 明升体育app_明升体育-官网

Ship your gemstone directly to one of our laboratories.

Prepare For Submission
HAND DELIVER

Bring your gemstone to any 16 drop-off locations in 11 countries.

Prepare For Submission

SUBMITTING MORE THAN 10 GEMS?

Please contact 明升体育app_明升体育-官网 directly for instructions.

  • 明升体育app_明升体育-官网 Customer Service: +1 800 421 7250 ext 7590 or +1 760 603 4500 ext 7590

  • Contact us

明升体育app_明升体育-官网 DELIVERS RESULTS YOU CAN TRUST

明升体育app_明升体育-官网’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, 明升体育app_明升体育-官网 is the world’s foremost authority in gemology.

The World's Foremost Authority in Gemology

Expertise

明升体育app_明升体育-官网 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, 明升体育app_明升体育-官网 operates independently of commercial and private interests, political lobbies and advocacy groups. 

Global Standard

明升体育app_明升体育-官网 reports are the benchmark of analysis and grading, and those who buy, sell or curate the world’s most important gems rely on 明升体育app_明升体育-官网.