Gems are an increase of the payout rate for your casino games. However, you must stake a minimum amount to be able to earn Gems, depending on the type of game.
For example:
You must stake at least €10 on dice games and dice slots to get the extra payout of 0.1% and receive 1 Gem. If you play €5 and then change to another game (finishing your session on the first game), you will not earn any Gems.
To enjoy the Power Gems program and receive Gems, you must always reach €10 in a single game. Your stakes do not accumulate over several games.