Wich one is the best for staff users?
Blue.
20 chars 
did u tested green gem already?
Not gonna lie, i didn’t, but i know crit attack stat works.
Ok look, attack formula in simple is like this (Attack - Enemy Def)*Crit 1.5+Crit. Attack, so for example blue gem gives you 300 attack, it will give you 450 attack when you crit. But you always will have 300 attack bonus, even you don’t crit.
Also crit rate on Wiz classes is not that high, so IMO blue/red is better than green/yellow.
I hope you understand my explanation.
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