Contra Costa Gem and Mineral Society Show - We Dig Rocks!

Want to ask a gemologist about grandma's stone ring, learn to pan gold, touch a Megalodon tooth or answer the age old question, 'What is Jet' we have it all. Tons of activities, exhibits, demonstrators and a whole room of rocks that glow. Active service, first responders get in FREE with ID. Largest show in Contra Costa County!