I will repost this since it seems to be an issue every page or two.
I got some information gathered up today when I was posting some Retribution stuff on our guild website. I will just throw down the information and if Anaxie wants to use it for the OP then feel free. This is assuming we stick with the 40% Haste area as our breakpoint.
Gemming for the Expertise/Haste caps 7.5% / 40%.
Under 17,000 Haste and below Expertise cap: Exp/Haste gems. Reforge all Expertise to Mastery.
Under 17,000 Haste and AT the Expertise cap: Str/Haste gems.
At 17,000 Haste and below Expertise cap: Exp/Mastery gems. Reforge all Expertise to Mastery.
At 17,000 Haste and AT the Expertise cap: Str/Mastery gems.
Thok's Trinket and how it affects your Haste Rating needed for 40%: (Thank Healiocentric for the nice image.)
LFR(2/2): 5.9754% | 17000 / 1.059754 = 16041 Haste Rating
Flex(2/2): 6.6823% | 17000 / 1.066823 = 15935 Haste Rating
Normal(2/2): 7.5427% | 17000 / 1.075427 = 15808 Haste Rating
WF-Normal(2/2): 7.9764% | 17000 / 1.079764 = 15744 Haste Rating
Heroic(2/2): 8.514% | 17000 / 1.08514 = 15666 Haste Rating
WF-Heroic(2/2): 9.0035 | 17000 / 1.090035 = 15596 Haste Rating
- - - Updated - - -
The reforging is obviously just for red slots. Not yellows or blues. So, please don't make a comment that says that we can gem for straight Mastery or Haste. Of course we can, but not in Red Sockets if you want the bonus.
The reason this works is that you want to eliminate as much Expertise on your gear as you can. So, you can effectively pick up more Mastery instead. More Mastery/Haste gear instead of Expertise/Haste or Expertise/Mastery. This works this way because they budget secondary stats on gems 2x over primary stats. IE, 320 Expertise over 160 Str.
The 17000 Haste is a roundabout number. It's not like you have to be at or over 17000. I just threw out the other numbers for the trinket at the request of another guildie.