This isn't the biggest Gem show of the Year (I believe the Leaf-Looker's in the fall is) but if you like jewelry then you can get some great deals here. There are a lot of pro-jewlers that come here to buy and sell. Also the motels tend to fill up but the campgrounds are okay. There is an admission fee (usually fairly low). The show is held across from the Whistle Stop Antiques Mall (They have a few RV sites that they rent out).
"May 6-8 - Macon County Community Building, US 441 South of Franklin. Sponsored by the Franklin Chamber of Commerce. Featuring gems & minerals, fine jewelry, and more. Hours 10am to 6pm Friday & Saturday, 12noon to 5pm Sunday Contact 800-336-7829"
http://www.franklin-chamber.com