The Gem Miner’s Holiday Gem, Jewelry, Mineral & Craft Show – happening this November 15-17 – is a premier event for gem lovers. Operated by the Mid-Atlantic Gem & Mineral Association LLC, also known as Gem Miner’s Shows, this event has been a staple in the gem and mineral community since its debut in November 2008. The show is held annually in mid-November in the Expo Center at the.