There are several ways that you can obtain gems in the game:
1. You get 1 gem for completing each level.
2. Fulfill the quests to authorize social networks from the game and add friends.
3. You can always buy gems. To order them, tap on “+” in the top panel, next to your current number of gems. Tap the button with the required number of gems in the pop-up window, enter your iTunes password, and confirm the purchase.
4. Follow our news in the Game Insight game center to make sure you don’t miss any special offers, which give you the chance to score various bonuses and great discounts.