Who We Are
GUILD is a gemological institution built on one principle — go to the source, document everything, and share what is learned with the world.
From a single laboratory in 1980 to a global network spanning the world's major gem-producing regions and trading centres, every part of GUILD follows the same path: first-hand evidence, rigorous science, and knowledge that the whole industry can trust and use.
GUILD Aurora International Gem & Jewelry Competition
Since 2022, Aurora has grown into one of the most anticipated stages in the gem and jewelry world — five editions, an international jury of industry leaders, and a competition that follows every gemstone from mine to masterpiece.
Latest Award Winners
What We Do
Our laboratory, our institute and our research are not separate businesses. They draw on the same field evidence and the same reference collection — and each one makes the others stronger.
Continuous, transparent and consistent gemological testing and certification — powered by Mine to Market field research and known-origin A-Type reference standards.
Professional gemology education grounded in continuous field research — turning first-hand discoveries into practical, up-to-date expertise for every level of the trade.
Peer-reviewed papers, journals and field publications from our laboratories and expeditions — open knowledge built on primary research and documented case studies.
The Common Core
At the centre of all three is the work that makes them possible: GUILD's Mine to Market Field Gemology.
Gemological knowledge begins at the source. Our judgments are grounded in direct field investigation, first-hand observation and traceable reference specimens collected by GUILD gemologists at active mining operations worldwide — every conclusion backed by evidence that can be traced to a precise location and date.
Latest from GUILD
Discoveries from the field, findings from our laboratories and milestones from the institute — as they happen.
