Originally Posted by
Old
You can completely ignore crit. This is a terrible stat and the gain from gems is very minor therefore negligible.
My spreadsheet was giving me perfect values, approved by testing (just swapping gems in your belt buckle socket). I was getting up to 25% gain from gemming Mastery instead of Intellect, without HotW. The key factor was simply getting a proper weapon because it's a straight up spellpower increase that only interact with mastery, not intellect.
Values and math I was using are roughly the same as from the EJ posts but with a more empirical approach, done mid-October.
Yesterday I tested the same, specced into HotW and I'm getting way more from Int than from Mastery.
The +10% buff we have as passive effectively lowers mastery if it works the same way every single flat buff ever worked (as I remember from Cataclysm). Gaining 1% in your Mastery is not giving you +1% healing. I'll try to fix my spreadsheet and give some feedback.