Originally Posted by Skyhoof
[Insightful Earthstorm Diamond]
It has a 2% chance to proc off any spell cast, including totems and water shield. You then gain 300 mana from “Mana Restore.”
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While the tooltip of the spell still says "2% Chance" I believe that this meta was changed in 2.3 to be 5%. Both
Thott and
Wowhead list the same, both being 5%. If it was changed this meta-gem seems significantly more valuable.
I see modeling the gem as a passive mp5 helps to simplify things, but spells/minute tends to vary widely, particularly as a healer. It seems to make more sense to me to model the effect as a flat -mana cost to each spell, -6 if its 2% or -15 if its 5%.