About Guild
Founded in 1980 in Los Angeles, Provide professional gemstone identification services for domestic and foreign practitioners.
Since Establishment
Years Detection data
Species Category tested
Latest Articles
Be Diffusion of sapphire
What are the cobwebs in sapphire? Diffusion treatments can be divided into surface diffusion and body...
Natural Emerald with Inclusions along Three Directions
Recently, Guild Gem Laboratories received a 10.48 ct sugarloaf emerald (figure 1) for identification and...
Latest Courses
Guild Field Gemology Courses
The ultimate real world learning experience because it is entirely in the real world. With the global supply chain getting smaller the way to grow is to go direct. The way to understand the market is to go see.