The price of the specialty teas seemnto increase every time you use one. For example; on first purchase, the Gyokuro Tea had a cost of 135 gems. The second purchase price was 150 gems.
Note: the increasing purchase price theory is based on my own observation of my game. Someone else should test to confirm.
|Gyokuro Tea||+50%||135 gems||7 Days|
|Tieguanyin Tea||+100%||270 gems||7 Days|
|Darjeeling Tea||+500%||1170 gems||7 Days|
|Da Hong Pao Tea||+1000%||4500 gems||7 Days|