Gems or GEMS can refer to: Gaston County EMS (GEMS), Gaston Emergency Medical Services, Ambulance Service for Gaston County, NC GEMS, "General Economic & Market Simulator", an advanced ESG (Economic Scenario Generator) authored by DFA Capital Management Inc., which's used in stochastic financial projections. gemstones, or Gems (album), the 1988 album by Aerosmith. Gems, a 1994 studio album by Patti LaBelle Gems TV, a shopping channel specializing in Gemstones. A package format of Ruby libr… (More on Gems)