Updated For 5.4 Mists of Pandaria

Gem Quality

Color Popularity Gem Quality Auction Price
Red/Blue 6 star Glinting Shadow Spinel
+25 Agility and +25 Hit
Epic
Red/Blue 4 star Glinting Tanzanite
+5 Agility and +4 Hit
Epic
Blue 2 star Rigid Serpent's Eye
+480 Hit
Epic
Red/Blue 2 star Assassin's Serpent's Eye
+160 Agility and +160 PvP Power
Epic