From WoWWiki

Bonuses for MP5 can only be obtained through Blue gems, Green gems and Purple gems.

Color	Name	Effect(s)
Blue	[Lustrous Zircon]	1 mana every 5 seconds
	[Lustrous Azure Moonstone]	2 mana every 5 seconds
	[Lustrous Star of Elune]	3 mana every 5 seconds
	[Lustrous Empyrean Sapphire]	4 mana every 5 seconds
Green	[Dazzling Deep Peridot]	1 mana every 5 seconds	+3 Intellect
	[Dazzling Talasite]	2 mana every 5 seconds	+4 Intellect
	[Dazzling Chrysoprase]	2 mana every 5 seconds	+5 Intellect
	[Dazzling Seaspray Emerald]	2 mana every 5 seconds	+5 Intellect
	[Effulgent Chrysoprase]	2 mana every 5 seconds	+5 Defense
	[Sundered Chrysoprase]	2 mana every 5 seconds	+5 Melee Critcal
Purple	[Royal Shadow Draenite]	1 mana every 5 seconds	+7 Healing
	[Royal Nightseye]	2 mana every 5 seconds	+9 Healing
	[Royal Tanzanite]	2 mana every 5 seconds	+11 Healing
	[Royal Shadowsong Amethyst]	2 mana every 5 seconds	+11 Healing