Hello... fellow jammers... here are some helpful codes, I hope. 
PS, if any of these are expired tell me! That would be a big help!

 ngexplorer - 1,000 gems
 management - 500 gems
 thanks - imprisoned phantoms
 adventure - 500 gems
 friendship - 500 gems
 tigris - 500 gems
 zambini - 500 gems
 chimbu - 500 gems
 nile - 500 gems
 ganges - 500 gems
 drawing - 500 gems
 shadows - 500 gems
 bemybuddy - 500 gems
 ajbday3 - Animal Jam third birthday cake
 explorer - 100 gems
 10million - 10,000,000 banner

 I hope this helped!