|Orange||+10 Parry||+10 Dodge|
|+8 Parry||+8 Dodge|
|+6 Parry||+6 Dodge|
|Purple||+10 Parry||+8 Stamina|
|+8 Parry||+6 Stamina|
|+6 Parry||+5 Stamina|
|Orange||+5 Parry||+4 Dodge|
|+5 Parry||+4 PvP Resilience|
|Purple||+5 Parry||+6 Stamina|
Before Patch 3.2.0 in particular, parry gems were generally considered inferior to dodge gems or defense gems because of the amount of avoidance they give when taking into account diminishing returns. This still may be true after the patch was released, but it should be less so.
On July 13, 2009, Greg "Ghostcrawler" Street, the Lead Systems Designer posted about this very topic on the forums:
Re: Avoidance Change | 2009-07-13 21:28 | Ghostcrawler
Oh yes. At some point "Not BiS" became "trash." :)
Q u o t e:
However, as far as the dodge vs parry, you've got to consider that a lot of people think in absolutes. "Parry is not as good as dodge" turns into "NEVER GEM PARRY BECAUSE IT'S A GARBAGE STAT". I don't think it'll change their perceptions, but that's more of a problem with humanity.
It's not the end of the world if parry gems rot. But we want to be able to put parry on say rings without those just being sharded.