Order Antique stick pin

Antique stick pin square shape with purple stone in the center and four small stones bead set in tiny leaf shapes positioned in the center of order each side of the frame. These small stones are blue in color but under 10x magnification appear to be glass. The center stone looks like an amethyst but it also could be glass. Metal acid tests to 18 karat yellow gold. Size 5/8” x 3/8”. Length 2 1/4”.