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
Red/Yellow/Blue 1 star Nightmare Tear
+10 All Stats
Epic
Red/Blue 1 star Sovereign Tanzanite
+5 Strength and +6 Stamina
Epic
Red/Blue 1 star Mysterious Serpent's Eye
+160 Intellect and +160 PvP Power
Epic