Most likely it's me doing something wrong, but I have no idea how or where I can buy gems.
When I try to make a purchase in the game I get a message that I should make the transaction in the Quest app, while in the mobile app I don't see the purchase option at all.
I love Cards&Tankards and would like to support the development of the game, but it looks like it's not such an easy task as one could expect 😅