Your a disc priest and you have 12 yellow gems, all of which have 12sp and 10 int except for 1 with haste. You have 31k base mana, I highly recommend swapping ALL of your gems for red sp gems. I doubt you ever even have to use mana pots / hymn of hope / shadowfiend or an innervate. Even if you did this you'd only be losing 110int which translates into like 2000 mana. You'd still be at like 29k base, and you'd be almost doubling your sp bonus from gems.
Btw, for your blue gems you have 3 with +5mp5 so that's 15mp5 which is really 3 mana a second which over a 5 min fight would equate to like 900 mana. That's like 1 extra spell per fight, and considering your obscene amounts of intel I highly doubt your getting the majority of your mana regen from anything other than replenish.
As for your talents, you have 1/3 absolution which again is to save you mana and you already have obscene amounts of it. You could drop that point and 1 out of grace and the 3 out of renew and put them in spell warding or divine fury and benefit a lot more. I don't see which other healer or healers your healing with in your raids so I'd have a hard time telling you exactly how I'd play it. But, I was consistently doing 2 man heals in ICC for the first 6 bosses for the last 4 weeks as disc and I was responsible for main tank healing. Flash Heal and Penance was enough to keep the tanks alive on festergut so I didn't see a point in divine fury and going for greaters. Your mileage may be diff but I found renew to be a wasted cooldown and just went for the extra survivability with spell warding.
My info:
http://www.wow-heroes.com/index.php?...name=Rickytick
I'm in a 10 man guild where I consistently 2 heal the first 6 encounters with a holy pally, blood council and queen we've been doing with 3 healers and the 3rd being a resto druid. We're not strict about it, we don't mind the 25 man loot I have and such.