
Originally Posted by Mokkhyr
kukulza: Thanks! According to your values the gem does not work as the description suggests, as it should at least buff the block value to 31,5% (0.3*1.05). Instead, it seems to be 31,05%.
I wondered how strong it is compared to the "good old" Austere Shadowspirit Diamond. (T11 provides ~36k armor)
Regular hit
Damage taken with Eternal Shadowspirit Diamond: 0.9 * (1 - 36000 / (36000 + 2167.5 * 88 - 158167.5)) = 0.427507382
Damage taken with Austere Shadowspirit Diamond: 0.9 * (1 - 36000 * 1.02 / (36000 * 1.02 + 2167.5 * 88 - 158167.5)) = 0.423065266
Block
Damage taken with Eternal Shadowspirit Diamond: 0.427507382 * (1 - 0.3105) = 0.294766339
Damage taken with Austere Shadowspirit Diamond: 0.423065266 * (1 - 0.3) = 0.296145686
Crit block
Damage taken with Eternal Shadowspirit Diamond: 0.427507382 * (1 - 0.621) = 0.162025297
Damage taken with Austere Shadowspirit Diamond: 0.423065266 * (1 - 0.6) = 0.169226106
Regarding crit block, the 0.621 value is not confirmed yet. It's just my assumption.
I did some napkin math based on these values & my current gear stats (1600 mastery rating) and the Eternal one seems to come out ahead in terms of overall damage mitigation. Unfortunately I'm not capable of doing the proper math factoring in Shield Block and HtL, so feedback is greatly appreciated. 
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I'm just curious if anyone else can elaborate mathematically on this.
Being Heroic Geared now I've switched to the SB Gem, assuming that the armor gem's value increases with your armor and decreases with the level of the enemies, while the block gem's value increases with your block chances and your total avoidance.
Is this true? I've seen some math formula's floating around but they seem to be extremely complicated. I'm not able to solve complex algebra - I've got my degrees in other subjects! !
What do you all think?
edit:
the formula I've seen floating around is:
DRavg = 1 - (1 - a)*(1 - d - v*(2c + b)), where
a is your armor DR,
b is your block chances (excluding crit blocks),
c is your crit block chances (for warriors),
d is your parry+dodge+miss chances,
v is your block value.
VS.
DRblock = ((2c + b)*(V - v)) / (1 - d - v*(2c + b)), where
b is your block chances (excluding crit blocks),
c is your crit block chances (for warriors),
d is your parry+dodge+miss chances,
v is your block value (without the gem),
V is your block value with the gem.
How does this stack up VS
https://spreadsheets.google.com/ccc?...CLPP7OsD#gid=0