Updated For 5.4 Mists of Pandaria

Gem Quality

Color Popularity Gem Quality Auction Price
Yellow/Blue 6 star Turbid Elven Peridot
+25 Spirit and +25 PvP Resilience
Epic
Yellow/Blue 6 star Zen Elven Peridot
+25 Spirit and +25 Mastery
Epic
Red/Yellow/Blue 6 star Nightmare Tear
+10 All Stats
Epic