Gem STR using Bold Cardinal Ruby. Gem Hit Rating if necessary to hit 262 cap. If you have a Meta slot, gem Chaotic Skyflare Diamond for +3% Crit Damage & +21 Crit Rating. (This Meta will require 2 blue gems, I recommend Sovreign Dreadstone for +10 STR +15 STA)
If your Blood Spec DPS, plan to gem Armor Pen when you hit about 5K GearScore.