• Gem is short for:
  • a cut rock or mineral, a gemstone
  • an engine made by Rolls-Royce plc, the Gem, primarily for use in the AugustaWestland Lynx helicopter.

• The three-letter acronym, GEM, can stand for the following:
  • the school of management, Grenoble Ecole de Management
  • in computing, a graphical environment manager

• Jem (which sounds like gem) could be:
  • a television animated series which aired in the mid-1980s
  • a character in Harper Lee's To Kill a Mockingbird
  • see Jem