''See also GEM and Jem

Gem can mean:

• Gemstone, a cut rock or mineral
• Gemini (constellation); "Gem" is the standard astronomical abbreviation
• Rolls-Royce Gem, a helicopter engine made by Rolls-Royce plc
• The Gem, an early 20th century British story paper
• Gem, the title character of "The Empath", a third season episode of Star Trek: The Original Series
• A package format of Ruby library under RubyGems