Well there really is only one meta gem right now for PVE Ret. I find it best for PVE.
Relentless Earthstorm Diamond
There really is no other choice. [+12 Agility & 3% Increased Critical Damage] Yep you read that right, every crit you have will be increased by 3%. Every crit, that’s hard to beat.
PVP is probably […]

Well, look what we have here. A new trinket, avaliable from a 5 man, one of the top DPS trinkets around. Slightly better for dual weilders but you have to love it agianst rogues.
Real simple answers. [Shard of Contempt]
(found this, slightly modified)
Q) Is Shard of Contempt an upgrade over -
A) Yes. Yes it is.
Q) […]