help please

[PennDirtDigger]

found these in a creek in western Pennsylvania along with a few bottles I've dated to the early 1900s

 

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[invent4hir]

I'm not sure what to call the piece in the first 2 pictures, but the depressions along the perimeter look like there was once cut glass or stones mounted in them. Compare to one of my earlier finds at http://www.treasurenet.com/forums/what/606831-too-small-brooch.html.