Also important to note,  deep arcane mages get 25% of their intellect as spell damage, along with moonkin, while deep holy paladins get 35% of their intellect (i believe, though it could be 25% as well).  Moonkin also get 10% of their intellect as mana regeneration.  Point is, fully raid buffed my gnome mage has something like 700 intellect (racial passive, arcane talent, kings...), which means this gem gives me 14 intellect, which in turn is 3.5 spell damage and 210 mana, along with the 14 from the gem itself, and some fraction of a %chance to crit.  If you use a 61/0/0, 40/21/0 or 40/0/21 (im the latter) this is probably the best meta gem in the game, and maybe the same for moonkin and shockadin, and maybe healadins too (i don't really know healing meta gems, and i don't know how much intellect they have, but extra mana is always nice, plus the healing)