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 2 star Stormy Deepholm Iolite
+50 PvP Power
Epic
Red/Yellow/Blue 2 star Nightmare Tear
+10 All Stats
Epic
Blue 1 star Rigid Majestic Zircon
+20 Hit
Epic
Yellow/Blue 1 star Balanced Elven Peridot
+25 Hit and +25 PvP Resilience
Epic