The Gems Capsule is a feature that allows players to recover spent gems by saving them on a capsule. Any in-game purchases using gems adds to the Capsule: gold coins, card packs, card upgrades, opening chests, opening the Piggy Bank and so on.
The Capsule can be obtained by opening Victory Chests, and once set, will remain available for 24 hours for the player to fill it up. Once completely full, the player can open the Capsule by tapping on it with no set time to do so. However, if the Capsule remains empty, it will disappear and must be earned again. There are no charges to open the Capsule.