I have very little experience with druid tanks but usually stamina is the way to go or every tank. While activating your meta gem with an agility/stamina gem as a druid.
That's the most common way of gemming between all the end game druid tanks
Solid Majestic Zircon (+30 Stam) in every slot except the one red it takes to activate the Meta. This should be a Delicate Cardinal Ruby (+20 Agi). Use the red in a piece that has a +6 or better Agi or +Stam socket bonus. See http://www.tankspot.com/showthread.p...al-Druid-Guide