If you receive a Sticker that is already in your Sticker Album, it will be automatically converted into Diamonds. The number of Diamonds you receive depends on the rarity of the Sticker.

Duplicate Shiny Stickers are automatically converted into Shiny Diamonds, which can be used to unlock exclusive Chests in the Diamond Shop.

Please note that duplicate Stickers do not increase your Sticker Album completion progress, as they have already been collected previously.