The best replacement for gem is jem.

The best alternatives to gem are rated as following:
★★★★★  jem
★★★★★  jewel
★★★★  mineral
★★★★  stone
★★  gem
★  shila
★  quorra
★  bundler
★  norwegian jewel
★  plugin
★  milgard
★  fork mount
★  breakaway
  diamond brite
  jewelry
  npm
  amora moissanite
  wintergreen boxwood
  think
  ttm
  bonehead
  grand soul gem
  mainboard

Your alternative for gem is not listed? Suggest!
Speaking about gem, one probably shouldn't forget about hit rating.

Other search terms related to gem and their ratings are:
★★★★★ hit rating
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Google Trends

Scale is based on the average worldwide traffic of gem in all years. Click on graph for more.
gem
jem
jewel