Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
So i used to get gems every time i login daily,but now it is suddenly not happening. I think something might've got broken. Or gamehag does not like to give gems to people.