You can receive gold stars for taking part in our weekly tournaments. They are available to all the players on 20th level and above, you just need to click on the icon with the crown on the right side of the game screen. You need to charge some of your game items in the Objectives menu and get points for them.
You will receive certain amount of crystals for certain amount of points and by the end of the tournament you will be ranked and receive the certain amount of golden stars depending on your place in the tournament.
The Tournaments usually start on Tuesday and end on Sunday.