Updated For 6.0.3 Warlords of Draenor

Gem Quality

Color Popularity Gem Quality
Blue 6 star Solid Serpent's Eye
+480 Stamina
Epic
Red/Yellow/Blue 2 star Void Sphere
+4 Resist All
Epic
Blue 2 star Solid Deepholm Iolite
+75 Stamina
Epic
Red/Yellow/Blue 2 star Nightmare Tear
+0 All Stats
Epic
Red/Blue 2 star Assassin's Serpent's Eye
+160 Agility and +160 PvP Power
Epic
Red/Blue 2 star Etched Tanzanite
+5 Strength and +4 Hit
Epic