Question on rings

[BlazingFelix]

Which ring is the set for mages? I usually go for attacking not supporting.
And also what's the difference between platinum rings and common rings?

[JaytB]

For pure int, I'm using: Fine crystal ring of bravery

Gives you: 1 crit, 2 m/s, 5 dmg

[BlazingFelix]

Oh yeah and what is the difference between common and platinum rings? Price?