Since 1981,GUlLD Gem Laboratories have consecutivelyparticipated in 44 Tucson Gem & Jewelry Shows , providingon-site identification and consulting services.

Since 1985, GUlLD Gem Laboratory has become a founding member of the International Colored Gemstone Association(ICA) and attended the first ICA annual Congress.In February2023,GUlLD President Liu Lihong and GUlLD Senior Vice President Andrew Lucas delivered a speech on “The Development of the Colored Gemstone Market in China” at theICA Annual Congress.

Charles Carmona, the founder of GUlLD Gem Laboratories,published The Complete Handbook for Gemstone WeightEstimation, which is an important reference book for practitioners of colored gemstones worldwide.

The GUILD research team released the 2021GUILD Color Gemstone Market Report, which is also the first market report released based on real data.

Release GUILD Gem Lab exclusive report