darkSpyro

Gems are a method of determining how active a user has been on the site and serve no other purpose beyond that.
To earn gems you just simply have to visit the website at least once a week as they are given out early Sunday morning / late Saturday night. It simply calculates whether or not you've visited during the past week and if you've posted or not (the number of posts is ignored). You get 7 for visiting and 3 for posting, it then generates a random number between 0 and 6 to give you as a bonus. So the maximum you can get in a week is 16 and you're guaranteed to get at least 10 if you visit and post.