Octagonal-shaped head with a rectangular piece of pressed glass, amethyst in color, is glued onto the top of the piece of metal. The base metal may be copper, gilded with silver on top, now quite worn. The metal is stamped with swirling designs. This top piece folds over the the base metal (copper, silver base metal?) into which the pin is attached on the back. Pin is 2 1/4" long Head is 9/16" in diameter