Since 1970. The Tucson Gem and Mineral Show® has enjoyed international stature since the 1970s, and was the first gem and mineral show to bring the hobby enthusiast, the public, and the curator/professionals together for discovery and discussion. Childrens area and programs. Exhibits of mineral specimens from the world's finest museums and private collections, world's largest show featuring mineral, gem, jewelry, lapidary and book dealers. This is a retail show.