Updated For 6.0.2 Warlords of Draenor

Gem Quality

Color Popularity Gem Quality
Red/Blue 6 star Glinting Imperial Amethyst
+80 Agility and +160 Hit
Rare
Red/Blue 2 star Assassin's Imperial Amethyst
+80 Agility and +80 PvP Power
Rare
Blue 1 star Rigid River's Heart
+320 Hit
Rare
Blue 1 star Perfect Rigid Lapis Lazuli
+320 Hit
Rare
Yellow/Blue 1 star Perfect Effulgent Alexandrite
+80 PvP Power and +160 Mastery
Rare