This thread is to provide a quick reference of gem prioritizaton for hunters in the Wrath of the Lich King expansion. It is still recommended to consult the Hunter spreadsheet for a more detailed assesment of your personal gearing. Subject to change. Feedback is of course appreciated.

Beast Mastery
Red:
[Bright Cardinal Ruby]
[Bright Dragon's Eye] (*Jewelcrafting only)

Yellow:
[Rigid King's Amber] (*if severely under hit cap.)
[Rigid Dragon's Eye] (*if severly under hit cap, Jewelcrafting only)

Blue:
Not recommended.

Orange:
[Pristine Ametrine] (*if not hit capped)
[Wicked Ametrine] (*if hit capped)

Purple:
[Infused Dreadstone]
[Balanced Dreadstone] (*if mana is a non-factor)

Green:
[Lambent Eye of Zul] (*if not hit capped)
[Vivid Eye of Zul] (*if not hit capped, and mana is a non-factor)
[Sundered Eye of Zul] (*if hit capped)
[Jagged Eye of Zul] (*if hit capped, and mana is a non-factor)
*Green gems are only advisable if to satisfy Meta requirement for both 1 Yellow and 1 Blue gem value. However, using a prismatic gem is generally superior to available greens.

Prismatic:
[Nightmare Tear]
*A prismatic gem will fill all the requirements for Meta gem. In 3.2, the epic level prismatic gem is almost always a superior option to either purple or green gems for filling Meta requirements.

Meta:
[Relentless Earthsiege Diamond]


Marksman
Red:
[Bright Cardinal Ruby] or [Delicate Cardinal Ruby] or [Fractured Cardinal Ruby]
[Bright Dragon's Eye] or [Delicate Dragon's Eye] or [Fractured Dragon's Eye] (*Jewelcrafting only)

Yellow:
[Rigid King's Amber] (*if severely under hit cap.)
[Rigid Dragon's Eye] (*if severly under hit cap, Jewelcrafting only)

Blue:
Not recommended.

Orange:
[Pristine Ametrine] or [Glinting Ametrine] (*if under hit cap)
[Wicked Ametrine] or [Deadly Ametrine] (*if hit capped, and over haste "soft-cap")

Purple:
[Infused Dreadstone] or [Tenuous Dreadstone] or [Puissant Dreadstone]
[Balanced Dreadstone] or [Shifting Dreadstone] (*if mana is a non-factor)

Green:
[Lambent Eye of Zul] (*if not hit capped)
[Vivid Eye of Zul] (*if not hit capped, and mana is a non-factor)
[Sundered Eye of Zul] (*if hit capped and over haste "soft-cap")
[Jagged Eye of Zul] (*if hit capped, over haste "soft-cap", and mana is a non-factor)
*Green gems are only advisable if to satisfy Meta requirement for both 1 Yellow and 1 Blue gem value. However, when using rare quality gems, using a prismatic gem is generally superior to available greens.

Prismatic:
[Nightmare Tear]
*A prismatic gem will fill all the requirements for Meta gem. In 3.2, the epic level prismatic gem is almost always a superior option to either purple or green gems for filling Meta requirements.

Meta:
[Relentless Earthsiege Diamond]

Three different options are listed for Marksman gemming. Raw attack power, Agility, and Armor Penetration. Attack power gems only seem to be beneficial for MM specs at the most entry level gearing (~200 and below ilvl). Armor Penetration gemming becomes viable at higher levels of gear past a certain threshold of ArP (generally ~650). The spreadsheet is the best indicator of when ArP passes Agility.


Survival
Red:
[Delicate Cardinal Ruby]
[Delicate Dragon's Eye] (*Jewelcrafting only)

Yellow:
[Rigid King's Amber] (**if severely under hit cap.)
[Rigid Dragon's Eye] (*if severly under hit cap, Jewelcrafting only)

Blue:
Not recommended.

Orange:
[Glinting Ametrine] (*if under hit cap)
[Deadly Ametrine] (*if hit capped.)

Purple
[Shifting Dreadstone]

Green:
[Vivid Eye of Zul] (*if not hit capped)
[Jagged Eye of Zul] (*if hit capped)
*Green gems are only advisable if to satisfy Meta requirement for both 1 Yellow and 1 Blue gem value. However, when using rare quality gems, using a prismatic gem is generally superior to available greens.

Prismatic:
[Nightmare Tear]
*A prismatic gem will fill all the requirements for Meta gem. In 3.2, the epic level prismatic gem is almost always a superior option to either purple or green gems for filling Meta requirements.

Meta:
[Relentless Earthsiege Diamond]


A few notes:
This is gauged primarily from spreadsheet calculations and existing in-game items. This does not suggest gemming values based on extended time durations (ie. the value of gemming a [Brilliant King's Amber]). The following talents are assumed: Serpent Swiftness for BM, Combat Experience for MM, Hunter vs Wild + Lightning Reflexes for Surv, and Careful Aim for all specs.

Jander, I see roughly the same with your toon on paper. About a .03 net dps gain switching from a Bright to a Delicate. With BM its rather pronounced that AP is superior and the invert is true for Survival. I'll really have to rethink how to describe MM. I'll revise accordingly.

I was in the middle of a long post explaining that for MMs with 4% agility from Combat Experience how agility versions of AP gems are viable options since they have similar DPS and the agility gems also provide a little more dodge (0.25%), 32 armor, and more crit (0.22%), with the crit helping with abilities or items that proc from it. Then I saw the updates you made already per Jander's note and deleted most of it. Some good options that you are still missing for MM are:

Purple:
- [Tenuous Twilight Opal] or [Balanced Twilight Opal] - since I do not have mana problems in raids I find the agi/AP + sta version the most useful

Green:
- [Vivid Forest Emerald] - if you need hit and once again the sta instead of mp5 version for more survivability and do not have OOM problems
- [Forceful Forest Emerald] - if you need haste

How about [Enchanted Tear] for satisfying the blue gem requirement? At a glance, it seems like 6 Agi 6 Int 6 Stam is comparable to the purple options listed here.

AP > AGI for quite some time as MM currently, but the amount by which is very very marginal. AP will probably always be better for BM because of how AP bleeds to pets.

This has been discussed before in some other threads. Short answer: no, AP will be worth the same amount relative to agi for BM as as it is worth now, if not more so.

I have no idea which gem comes out on top for a Marksmanship build, but I think the difference is so small that we can basically have two types of Hunters:

Those who gem with Brights (AP) and can pretty effectively switch between BM and Marks specs.

Those who gem with Delicate (Agil) and can very effectively switch between Marks and Survival specs.

I'm inclined to say Agility is better for Marksmanship cause of the little 4% boost the tree offers it... also Marks crit numbers are pretty high to say the least.

Marks Hunter with raid buffs:

100 Agility = 125.8 AP & 1.37% Crit
200 Attack = 220 AP

Survival Hunter with raid buffs:

100 Agility = 173.9 AP & 1.52% Crit
200 Attack = 220 AP

Obviously SV is the Agility spec, everyone knew that... but the scaling difference is quite pronounced compared to Marks, guess I just felt like doing a little math to show the difference.

Actually I am seeing [Enchanted Tear] roughly on par with the Purple selections in-game currently, give or take, perhaps slightly under. Where they really shine is if needing a to fill both a Yellow and Blue socket for Meta requirements; I don't see any Green gems that are really comparable at the rare quality level (even +hit/(blue) gems). This is likely different at the epic gem level, since I don't believe there are any epic equivalents of the [Enchanted Tear].

To elaborate on the AP gem topic, there are a few factors attributing to the apparent viability right now (for BM).
Agility at level 70 was worth .025% crit per point - at level 80 its down to .012% so the effective crit value is diminished while 14 AP still = 1 dps. Pet scaling has moved up to 22% and AP is the only value we have to directly scale up pet damage; with all the +damage modifiers in the BM tree, pets scale amazingly well with AP. Pre-WotLK, Agility got an extra +10% via Blessing of Kings in raids; in WotLK AP also scales by +10% in raid due to Trueshot Aura/Abomination's Might/Unleashed Rage. Lastly (and rather minor) is that Serpent Sting is now a viable part of the rotaion, and can only scale through AP.

I am noticing a few of these gem cuts may be currently not yet implemented (Shifting, Tenuous cuts?). If you notice one, please feel free to note it.

Hmmm. So, is Agility currently beating Crit Rating in all cases? If not, it seems like [Chaotic Skyflare Diamond] would be a good choice.

Hey, are you ok with me using this list in my WotLK Pre-Raid gear & more thread on TKAsomething and Allakhazam?
As it is much better than what is in there at the moment.

You'll get the credits of course.

For hunters that want to improve the size of their mana pool [Brilliant Autumn's Glow] (I apologize, I haven't learned how to link items yet) would be helpful. If you have [Careful Aim] as part of your talent build, then it will also be a direct DPS increse, albeit a small one.

Edit: Thank you Garby for the wonderful instructions on linking items. I linked the items in this post.