Post by Sorenhawk
I have only been lvl-capped for a few weeks and I don't really know which gems I should buy.
Should I get raw int, crit, mastery or hit?
Here's a link to my armory:http://eu.battle.net/wow/en/character/skullcrusher/Noxion/advanced
Post by Nathanyal
This should answer you question.
As well as any others you might have about playing as Arcane.
There are also Fire guides if you change specs at any time.
The rule of thumb is, always use gems that have some int in them. Either the +40 gems or the +20/20 gems. Int is the best stat you can get as a mage, being about 5 times as good as any other stats.
You'll also want to watch the socket bonus. If it is more than just using pure int gems, match the sockets. Take your legs as an example, you can either use 3 +40 int gems, for a total of 120 int. Or you can match the sockets with 2 +40int gems, a +20 int/mast gem, and the +30 int bonus, giving you a total of 130 int and 20 mast.