Gems serve as the hard currency of the game. It is primarily obtained through in-app purchases, with limited amounts available through completion of daily or weekly missions, opening chests, leveling up, participating in a Ranked season, and selling fortress designs in the Bazaar. Gems can be used instead of coins to unlock progress, allowing players to accelerate the content unlock process if they wish to pay. Additionally, Gems can be used to buy premium content which is only available through spending Gems, such as skins, banners, and top tier fortresses (as determined by the community)