Gems are a reward for quests related to social activity:
- for posting a review of the game in the app store;
- for liking G5 Facebook page;
- for subscribing to G5 newsletter;
- for telling a friend about the game;
- for subscribing to The Hidden Treasures Facebook page;
- for subscribing to The Hidden Treasures Instagram;
- for adding three friends;
- for sending three gifts to friends;
- for sending a message to a friend;
- for sending collection item requests to three friends.