What gems should I be looking for on a feral Druid to wear on my armor now that I am 70?

I am looking at gem that are going to increase Stam, Agil, Strength is that correct for tanking?

yes

i was told that I should be looking at defence rating gems any thoughts on that?

As a feral tank i recommend you fill all available slots with Solid Star of Elune (+12 stamina) unless your Defense is less than 415 in which case you may want to put a few of those in (dont worry about the gem bonus, most of the time it really isnt worth it)

As for cat, get Agility gems. Damage, crit, dogde. Cant ask for anything better. i've been thinking about how useful haste rating would be, cat form has 1 second hit time and it can be reduced. just a thought, i have a little haste rating and my hit time is about .96