LaboratoryInstitute
Official Merchandise
GUILD Institute of Gemology
GUILD Gem Testing Kit
A curated set of professional-grade gemological instruments for field identification, classroom instruction, and everyday gem trade use.
Field-readyLaboratory-informedFour decades of practice
GUILD Editorial
The Handbook of Field Gemology
A mine-to-market field gemology guide by Andrew Lucas, integrating global field expeditions, sourcing strategy, and supply chain insight for modern gemstone professionals.
2026 Updated Edition
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More products are on the way — apparel, instruments, and reference materials curated for gemological education and professional practice.