Gems are collectibles found in Jetpack Joyride when players activate the Gemology gadget. While equipped, Gemology turns some coin into red gems that are worth 5x the value of a normal coin.
Gems are also spawned by purple Missiles spawned during Rocket Time, in trails.
- Gems are red, and have a square-emerald cut, which is similar in appearance to a ruby.
- According to the Gemology gadget's description, only coins minted in 1985 can be turned into gems.
- Gemology can be paired with the Diamonds in the Bling It On! event for maximum effectiveness.