Stam Czar reporting in.
I recommend gemming straight stam except for 1 red/stam gem that matches a +9 stam bonus or higher to activate your meta, however the alternative method to gemming is to hit any socket bonus that is +9 stam or higher with a color/stam gem. If a socket bonus is not +9 stam or greater, it is not worth it, gem stam.
Edit: at least I believe those rules hold true for DKs as well.
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