200 Gems or 
5500 Favor
100 Gems or 9500 Favor
400 Gems
Rare roll from treasure chest.
500 Gems (Summer of SMITE Exclusive)
200 Gems (Pirate's Booty Chest); Rare roll from treasure chest.
10 Million Celebration achievement (Win 10 matches during August 2015); Voice Pack & God unlocked as well.
200 Gems or 9500 Favor at God Mastery 1
300 Gems or 12500 Favor at God Mastery 5
400 Gems or 15000 Favor at God Mastery 10