Coins is only for a x2 coins booster. As for the emerald rank has some old perks, there is no more boosted coins instead of 2x coins with their rank, even all ranks too, because it has been removed many months ago. You need to use yellow, blue and green gems to get a money x2 booster from the mystical box.
Don't spam.
What about the experience and particles and if i get a 2× booster will it expire as it says that it won't expire for premium members.
Unfortunately, EXP and Particles don't have a x2 booster, since it will no longer work for us. And yes, a x2 booster expires in a few days if you earned them by using any gems.