Gems are a free in-game currency that can be used to enter games.
How to earn Gems:
Login rewards
Every 24 hours you can earn Gems and Bonus Cash rewards just by logging in!
Referrals
Refer your friends to earn Gems and Bonus Cash
Gem rewards
Check the rewards tab for free redeemable Gems
Playing gem games for cash
You can enter cash tournaments using gems by using the group tournament game mode in the "Free" section of any game. These tournaments require larger sums of gems to enter, and can pay out up to $0.60.