Button and rosette?

[jefg231]

Found these items in a farm field... Any insight on the rosette?

 

[Mud Hut]

which is which?

 

[nhbenz]

I may be wrong in part or entirety but the one I presume to be the button seems to be a Japanese style picture button, with perhaps a bamboo theme? I think of these as in the 1890's ballpark. I realize you asked more about the rosette, but I'm sure I know nothing about that one.

 

[Ant]

Hope this clears the pics up a little:

 

[Mud Hut]

I am not seeing anything that suggests either is rosette.