Updated For 6.0.3 Warlords of Draenor

Gem Quality

Color Popularity Gem Quality
Red/Blue 6 star Mysterious Serpent's Eye
+160 Intellect and +160 PvP Power
Epic
Red/Yellow/Blue 2 star Nightmare Tear
+0 All Stats
Epic
Red/Blue 1 star Timeless Tanzanite
+5 Intellect and +6 Stamina
Epic