Spend Gems for Gold. Limited number of uses per day (though the limit is irrelevant when you are VIP).
Limit[]
Non-VIP: Twice a day, for 20 Gems
VIP 1: 10 Times
VIP 2 and onwards: 20 Times * VIP Level (Eg: VIP 7 = 140 Times)
Cost[]
20 Gems for X Gold