Can anyone identify this pin?

[Blockade Runner]

I dug this on a site where everything else was civil war.
Never have known if old or costume, if the stone is real or fake
or even what it is supposed to be.

 

[John 'n' W.Va]

n/t

 

[awhitster]

I knew the looks of that stone, I just couldn't remember the name. That's a keeper for sure.

 

[Uncle Willy]

Tis an opal and a purty one.

Bill