Updated For 5.4 Mists of Pandaria

Gem Quality

Color Popularity Gem Quality Auction Price
Red/Blue 6 star Shifting Tanzanite
+5 Agility and +6 Stamina
Epic
Red/Blue 6 star Assassin's Serpent's Eye
+160 Agility and +160 PvP Power
Epic
Red/Blue 6 star Accurate Shadow Spinel
+25 Expertise and +25 Hit
Epic
Red/Yellow/Blue 6 star Nightmare Tear
+10 All Stats
Epic