There isnt anything wrong with gemming red sockets with Dodge/Stam or Expertise/Stam, or Parry/stam(if you somehow reach DR on dodge rating), but blue sockets, and anything where a socket bonus will probably be useless, gem straight up stamina.
It is also good to keep a high stam avoidance set, a high stam threat set, a high stam SBV/SBR set, and of course, w/e other sets you find useful for encounters, but if you dont have a fight on farm, just worry about effective health.
Gem the stam, be the judge on what bonuses you want. 12 stamina is a great bonus to meet colors for, as well as expertise bonuses if you are under the dodge cap. Hit and anything under 9 stamina, are pretty mediocre compared to the others.
As for yellow sockets, I usually go with 10 hit / 15 stam, as long as the bonus is decent, otherwise, 30 stam.
Prismatics (Belt Buckle, BS Sockets), always gem for 30 stam, nothing else.