Well, after some research, I have composed a little table. It's a little lacking in info so can you please contribute to it? Because, I don't really want people to keep over donating :)
Item Favour
Gems
Amber 20
Sapphire 40
Ingots
Metal 3
Music box
DG1 40
DG3 50
DG4 60
DB4 60
DR4 60
DR5 70
XS1 40
XS3 50
Seasoned Beans
Wood 20
Anything else 15
Seasoned Eggs
Butterfly 40
Chicken 20
Piggy 30