The most up-to-date information about vendors, news, and weather for the Magic Valley Gem Club Annual Rock & Gem Show. Check out the show's floor plan and the products that will be sold. The Magic Valley Gem Club Annual Rock & Gem Show starts on 3/7/2020. The Show ends on 3/8/2020. The Show is located at: Twin Falls County Fairgrounds 215 Fair Avenue, Filer, Idaho 83328, United States.