GUILD Gemstone Laboratory-GUILD-Colored Stone Report-Pearl Report-Field Expedition

ABOUT US

About Guild

Founded in 1980 in Los Angeles, Provide professional gemstone identification services for domestic and foreign practitioners.

1980

Since

Establishment

43

Years

Detection data

50

+

Species

Category tested

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LATEST RESEARCH

Research & Lab Updates

Relationship Between Common Treatments Applied to Rubies and Their Stability

Journal of Gems

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THE HANDBOOK OF FIELD GEMOLOGY

Research & Lab Updates

Tahitian Pearl Identification and Treatments

Volume2-No.1-2021

Volume2-No.2-2021

LATEST COURSES

Advanced Emerald Identification and Evaluation

Emerald Identification and Evaluation Course

Ruby and Sapphire Identification and Evaluation

MICRO WORLD OF GEMS

Finely alternating color bands in a Madagascar sapphire, forming a unique landscape.

A heart-shaped carbonate included crystal shines with a red glow in a natural ruby from Mogok, Burma

Gota de Aceite, resulting from rapid columnar growth zoning, seen in natural Colombian emeralds.

Classical three-phase inclusions are commonly seen in a Colombian emerald.

Exsolved rutile needles and platy iron-rich mineral (probably ilmenite or hematite) often display ir

Finely alternating color bands in a Madagascar sapphire, forming a unique landscape.

FIELD EXPEDITION

Andrew Lucas ，President of Guild Education

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Guild Field Gemology Courses (global classes held at mining and source markets around the world)

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Guild Market Gemology Classes (global classes held at manufacturing international market centers around the world)

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