This is a vintage gold tone filigree oval stick pin with a purple faceted oval stone/glass piece in the center. I do not know if the purple is amethyst or glass. It is open back. The oval is 5/8" tall. The pin portion is slightly bent. It is marked RIDCO on the shaft. The little clasp piece is missing. MBR.
Gold Tone Purple Stone Filigree Stick Pin Vintage Signed RIDCO