It's a...Unicorn..

[thedukeofdelaware]

This is a pink and green and shiny little guy. There is a unicorn and a flower. Is it a button? How old is it? I have no idea. Please feel free to drop some knowledge if you have it. Thanks for looking!

 

[Old Pueblo]

c.1900 would be my guess, maybe a bit newer. It does look like it has some age on it.

 

[DCMatt]

I'm thinking... broken earring. "Vintage"... Meaning "not older than me".