Updated For 5.4 Mists of Pandaria

Gem Quality

Color Popularity Gem Quality Auction Price
Red/Blue 6 star Assassin's Serpent's Eye
+160 Agility and +160 PvP Power
Epic
Blue 5 star Rigid Serpent's Eye
+480 Hit
Epic
Red/Yellow/Blue 2 star Nightmare Tear
+10 All Stats
Epic
Red/Blue 2 star Mysterious Serpent's Eye
+160 Intellect and +160 PvP Power
Epic