Purple gems

From WoWWiki

Purple Gems fits both red and blue sockets. Some of the bonuses provided by purple gems are:

Purple
Strength	Stamina	Sovereign
Spell Damage	Stamina	Glowing
Healing	Mana every 5 seconds	Royal
Agility	Stamina	Shifting
Attack Power	Mana every 5 seconds	Infused

The following gems can be cut into purple gems:

• [Shadow Draenite]
• [Nightseye]
• [Shadowsong Amethyst]

Tanzanites also drop from bosses in certain heroic instances.

Purple, match red or blue sockets.
Gem	Effects		Source	Gem	Effects		Source
[Sovereign Shadow Draenite]	+3 Strength	+4 Stamina	C, Vl	[Shifting Shadow Draenite]	+3 Agility	+4 Stamina	Cf, Vl
[Sovereign Nightseye]	+4 Strength	+6 Stamina	C	[Shifting Nightseye]	+4 Agility	+6 Stamina	C
[Sovereign Tanzanite]	+5 Strength	+6 Stamina	D	[Shifting Tanzanite]	+5 Agility	+6 Stamina	D
[Sovereign Shadowsong Amethyst]	+5 Strength	+7 Stamina	C	[Shifting Shadowsong Amethyst]	+5 Agility	+7 Stamina	C
Gem	Effects		Source	Gem	Effects		Source
[Glowing Shadow Draenite]	+4 Spell Damage	+4 Stamina	C, Vl	[Balanced Shadow Draenite]	+6 Attack Power	+4 Stamina	C
[Glowing Nightseye]	+5 Spell Damage	+6 Stamina	C	[Unstable Amethyst]	+8 Attack Power	+6 Stamina	V
[Glowing Tanzanite]	+6 Spell Damage	+6 Stamina	D	[Balanced Nightseye]	+8 Attack Power	+6 Stamina	C
[Infused Amethyst]	+6 Spell Damage	+6 Stamina	Q	[Brutal Tanzanite]	+10 Attack Power	+6 Stamina	D
[Glowing Shadowsong Amethyst]	+6 Spell Damage	+7 Stamina	C	[Pulsing Amethyst]	+10 Attack Power	+6 Stamina	Q
				[Balanced Shadowsong Amethyst]	+10 Attack Power	+7 Stamina	C
Gem	Effects		Source	Gem	Effects		Source
[Royal Shadow Draenite]	+7 Healing	+1 Mana every 5 sec	Cf, Vl	[Infused Shadow Draenite]	+6 Attack Power	+1 Mana every 5 sec	C
[Royal Nightseye]	+9 Healing	+2 Mana every 5 sec	C	[Infused Nightseye]	+8 Attack Power	+2 Mana every 5 sec	C
[Royal Tanzanite]	+11 Healing +4 Spell Damage	+2 Mana every 5 sec	D	[Infused Shadowsong Amethyst]	+10 Attack Power	+2 Mana every 5 sec	C
[Royal Shadowsong Amethyst]	+11 Healing +4 Spell Damage	+2 Mana every 5 sec	C
Gem	Effects		Source	Gem	Effects		Source
[Purified Jaggal Pearl]	+7 Healing +3 Spell Damage	+3 Spirit	C	[Regal Nightseye]	+4 Dodge Rating	+6 Stamina	C
[Unstable Sapphire]	+9 Healing	+4 Spirit	V	[Regal Tanzanite]	+5 Dodge Rating	+6 Stamina	D
[Purified Shadow Pearl]	+9 Healing +3 Spell Damage	+4 Spirit	C	[Defender's Tanzanite]	+5 Parry Rating	+6 Stamina	D
[Imperial Tanzanite]	+9 Healing	+5 Spirit	D	[Fluorescent Tanzanite]	+6 Spell Damage	+4 Spirit	D
[Purified Shadowsong Amethyst]	+11 Healing	+5 Spirit	C
Gem	Effects		Source
[Blessed Tanzanite]	+11 Healing	+6 Stamina	D
[Soothing Amethyst]	+11 Healing	+6 Stamina	Q