Generally rectangular filigree pin. Possibly Sterling that is not stamped. A flat wire very intricate filigree fills the space and is centered with an oval bezel set white opal that has colors including green orange and red. The opal is cut in a cabochon shape. The entire pin is bordered by a thin notched wire edging. There are four dots of metal extending above the surface of the pin. Tube hinge and c clasp. The pin stem extends far beyond the c clasp. 2 1/4" long. 1 3/8" wide