Updated For 6.0.3 Warlords of Draenor

Gem Quality

Color Popularity Gem Quality
Red/Yellow/Blue 6 star Void Sphere
+4 Resist All
Epic
Yellow/Blue 6 star Jagged Elven Peridot
+50 Critical Strike and +37 Stamina
Epic
Blue 6 star Sparkling Deepholm Iolite
+100 Spirit
Epic