In June 1991, the GEM collaboration was formed to design a major particle detector for the Superconducting Super Collider, focusing on precision measurements of leptons and photons. Concurrently, the GIA held its International Gemological Symposium, highlighting new gem discoveries in Vietnam and rare "chameleon" diamonds. Read the full GIA symposium details in GIA's Summer 1991 publication . AI responses may include mistakes. Learn more The GEM experiment at the SSC - ADS