Gems are one of the two currencies in Shop Heroes and is primarily used to enhance your gameplay. You can use gems to speed up tasks, purchase shop decorations, customize your shopkeeper and unlock powerful chests, just to name a few things.
You’re automatically given a pile of gems when you first start the game and are awarded more for unlocking certain achievements, leveling up and completing story quests. You can also purchase additional gems by tapping or clicking anywhere on the gems bar docked on the top of the screen.