You can purchase Gems from the Shop by tapping [Menu] > [Shop] > [Gem Shop].
*Confirm the statement regarding the Act on Specified Commercial Transactions displayed in the Shop to proceed with purchasing.

[Note for Android Users]
When purchasing Gems, the payment method you registered for Google Play will be charged.
*If you have inquiries regarding your payment method, please contact Google.

[Note for iOS Users]
When purchasing Gems, the credit card or gift card you registered for the iTunes App Store will be charged.
*If you have inquiries regarding your payment method, please contact Apple.