There are two in-game currencies - chips and gems.
 
You can use the gems to get customization items from the in-game store.
 
The store is accessible via the tabs on your profile.
 
With your gems you may get:
  • Avatar frames
  • Table backgrounds
  • Card decks
  • XP Booster
  • Extra spots in the block list
  • Name change
  • Premium gifts
  • Reset Partner Rating
  • Reset stats