For the Serpent's Eye thing, I'd say it's probably not worth it to use them unless the Stamina one is very significant. Three more +320 resilience gems, a total of 960 resilience, is better than another 5kish health.
Mastery is good but useless against casters. (They really should make Shield Barrier scale with Mastery for this reason.)
10/03/2012 03:19 PMPosted by Chòpperserpent's eye gems are 480 mastery or 480 stamina
But Mastery shares a color with Resilience, so to gem Mastery, ever, you sacrifice resil. I sincerely doubt the 1440 Mastery (which is not that much in actual block chance conversions, only about 3-4%) is worth 980 resil which is something like 3% overall damage reduction.
480 stamina per gem x 3 gems gives a Prot Warrior 23k more health. That's one special attack from basically any class.
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