'Sugar' Nephrite from the Altun Mountains, Xinjiang, China
Nephrite has a long history and profound culturalsignificance in China, along with a vast consumer market. In July 2025,...

Peer-reviewed research, conference presentations, and scholarly contributions advancing gemological science and practice.
The study of inclusions within gem materials provides important insights into their crystallisation processes and the geological conditions of their formation. Recently, Guild Gem Laboratories gemmolo...
Nephrite has a long history and profound culturalsignificance in China, along with a vast consumer market. In July 2025,...
The study of inclusions within gem materials provides important insights into their crystallisation processes and the ge...
A pink sapphire weighing over 20 ct was recently submitted to Guild Gem Laboratories, and it presented a particularly ch...
Annual editions documenting the evolution of gemological knowledge, new treatments, emerging sources, and field research findings.
Photographic documentation from GUILD's ongoing field operations worldwide—from mining sites to processing centers, capturing the real contexts where gemological knowledge begins.





