Need help with certain part in game.

Hello! I'm having trouble with a certain part in my game. So there are 8 crystals that need to be activated 2 blue, 2 green, 2 red, 2 purple. Each crystal is activated by one colored gem. After all 8 are activated to then I want the player to go to the center circle and start with dialogue. And i'm not sure on how to do that exactly. I already have an event there from earlier so I know I need a conditional branch but the thing is the player could activate one of the crystals and then step in the circle without truly activating them all. So I guess what i'm asking is there a way to set up multiple conditions on one branch or is there an easier way of doing this?

​Here are some screenshots (if it helps)

make each crystal increase a variable upon activation then check if that variable is equal to 8 when the player goes to the center, if not, then do nothing

@Engr. Adiktuzmiko Thank you so much it worked!