Updated For 5.4 Mists of Pandaria

Gem Quality

Color Popularity Gem Quality Auction Price
Yellow 6 star Smooth Serpent's Eye
+480 Critical Strike
Epic
Red/Yellow 4 star Potent Lava Coral
+25 Intellect and +25 Critical Strike
Epic
Red/Yellow 2 star Artful Lava Coral
+25 Intellect and +25 Mastery
Epic