Gems are collectibles found in Jetpack Joyride when players activate the Gemology gadget. While active, some coins turn into red gems. Due to their rarity, each is worth five coins. They can be attracted by magnets. When the "double coins" or "counterfeit machine" ability is on, the gem is worth 10 coins.
- Gems are red, and have a square-emerald cut, which is similar in appearance to a ruby
- Gems only appear when the Gemology gadget is activated.
- 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.