GUILD

Field-Driven Gemology

Our judgments are grounded in field investigation, first-hand data, and traceable reference samples—validated through scientific analysis.

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ABOUT GUILD

Your Trusted Partner in Gemology

For over four decades, GUILD has been at the forefront of gemological science, providing comprehensive laboratory services and world-class education. We combine cutting-edge technology with deep expertise to deliver reliable, accurate results that professionals worldwide depend on.

40+Years of Excellence
1.5M+Certificates issued worldwide
100K+Professionals Trained
Gemological Analysis
What We Do

Our Services

Laboratory Testing
01

Gem Laboratories

Continuous, transparent, and consistent gemological testing services powered by Mine to Market field research and A-Type reference standards.

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Education Programs
02

Institute of Gemology

Evolving gemological education grounded in continuous field research, transforming firsthand discoveries into practical, up-to-date expertise.

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Gemology Research
03

Gemology Research

Peer-reviewed papers, journals, and publications from our laboratories and field programs—open knowledge built on primary research and documented case studies.

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Mine to Market

Field
Gemology

GUILD's field gemology practice forms the foundation of our research and knowledge creation. Through direct engagement from mine to market, we generate first-hand insights that advance the entire industry.

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Latest Updates

News & Research

Latest discoveries, research findings, and industry developments from GUILD laboratories and field operations.

ResearchAugust 4, 2026

Grandidierite Inclusions in a Sri Lankan Sapphire

Grandidierite Inclusions in a Sri Lankan Sapphire Inclusions serve not only as important features for determining a gemstone's origin but also as indicators of the geological environment in which the ...

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ResearchAugust 4, 2026

A Rare Inclusion Assemblage in a Ruby from Mogok, Myanmar: Lazurite, Sulphur and Bystrite

A Rare Inclusion Assemblage in a Ruby from Mogok, Myanmar: Lazurite, Sulphur and Bystrite A 2.22 ct oval-cut ruby was recently submitted to Guild Gem Laboratories for identification (Figure 6). Fourie...

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ResearchJune 4, 2026

Fayalite Inclusion in Guatemalan Jadeite-Omphacite Jade

Fayalite Inclusion in Guatemalan Jadeite-Omphacite Jade Figure 1: The jadeite-omphacite cabochon in this pendant (29.40 x 20.87 mm) was found to contain some interesting inclusions. Photo by Siqi Luo...

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