Were you looking for Northrend purple gems?

These gems are specific to . See the following page for all Cataclysm gems by color.

Cataclysm purple gems provide the following bonuses:

Purple
Agility	Hit Rating	Glinting
Agility	Stamina	Shifting
Expertise Rating	Hit Rating	Accurate
Expertise Rating	Stamina	Guardian's
Intellect	Hit Rating	Veiled
Intellect	Spirit	Purified
Intellect	Stamina	Timeless
Parry Rating	Hit Rating	Retaliating
Parry Rating	Stamina	Defender's
Strength	Hit Rating	Etched
Strength	Stamina	Sovereign

The following gems are cut into purple socket gems:

• [Nightstone]
• [Demonseye]

List of gems: 

Purple, match red or blue sockets.
Gem	Effects		Source
[Glinting Nightstone]	+15 Agility	+15 Hit Rating	Trainer
[Perfect Glinting Nightstone]	+18 Agility	+17 Hit Rating	Gem Perfection
[Glinting Demonseye]	+20 Agility	+20 Hit Rating	Vendor Recipe
[Shifting Nightstone]	+15 Agility	+23 Stamina	Trainer
[Perfect Shifting Nightstone]	+18 Agility	+26 Stamina	Gem Perfection
[Shifting Demonseye]	+20 Agility	+30 Stamina	Vendor Recipe
[Accurate Nightstone]	+15 Expertise Rating	+15 Hit Rating	Trainer
[Perfect Accurate Nightstone]	+18 Expertise Rating	+17 Hit Rating	Gem Perfection
[Accurate Demonseye]	+20 Expertise Rating	+20 Hit Rating	Vendor Recipe
[Guardian's Nightstone]	+15 Expertise Rating	+23 Stamina	Drop
[Perfect Guardian's Nightstone]	+18 Expertise Rating	+26 Stamina	Gem Perfection
[Guardian's Demonseye]	+20 Expertise Rating	+30 Stamina	Vendor Recipe
[Veiled Nightstone]	+15 Intellect	+15 Hit Rating	Trainer
[Perfect Veiled Nightstone]	+18 Intellect	+17 Hit Rating	Gem Perfection
[Veiled Demonseye]	+20 Intellect	+20 Hit Rating	Vendor Recipe
[Purified Nightstone]	+15 Intellect	+15 Spirit	Drop
[Perfect Purified Nightstone]	+18 Intellect	+17 Spirit	Gem Perfection
[Purified Demonseye]	+20 Intellect	+20 Spirit	Vendor Recipe
[Timeless Nightstone]	+15 Intellect	+23 Stamina	Trainer
[Perfect Timeless Nightstone]	+18 Intellect	+26 Stamina	Gem Perfection
[Timeless Demonseye]	+20 Intellect	+30 Stamina	Vendor Recipe
[Retaliating Nightstone]	+15 Parry Rating	+15 Hit Rating	Drop
[Perfect Retaliating Nightstone]	+18 Parry Rating	+17 Hit Rating	Gem Perfection
[Retaliating Demonseye]	+20 Parry Rating	+20 Hit Rating	Vendor Recipe
[Defender's Nightstone]	+15 Parry Rating	+23 Stamina	Drop
[Perfect Defender's Nightstone]	+18 Parry Rating	+26 Stamina	Gem Perfection
[Defender's Demonseye]	+20 Parry Rating	+30 Stamina	Vendor Recipe
[Etched Nightstone]	+15 Strength	+15 Hit Rating	Trainer
[Perfect Etched Nightstone]	+18 Strength	+17 Hit Rating	Gem Perfection
[Etched Demonseye]	+20 Strength	+20 Hit Rating	Vendor Recipe
[Sovereign Nightstone]	+15 Strength	+23 Stamina	Trainer
[Perfect Sovereign Nightstone]	+18 Strength	+26 Stamina	Gem Perfection
[Sovereign Demonseye]	+20 Strength	+30 Stamina	Vendor Recipe