Premium Tickets much like Event Tickets are an in-game currency. They can be acquired with Corusca Gems. Currently they are saved between Events. They do not cause you to expend any energy to use, so you can play the event in the 15 minute intrums between energy replenishment. They are also used after all event tickets are used.
Purchasing Premium Tickets
Tickets can be acquired in the following amounts - 3 for 3 gems, 12 for 10 gems, 26 for 20 gems, 56 for 40 gems, and 120 for 80 gems.
Needing citation and clarification.
You can also get durasteel tokens with it when it is on events that give you that sale.