Vintage silver and garnet brooch

antique/vintage brooch featuring a large oval deep burgundy-red faceted stone in an ornate silver-tone setting with beaded detailing and symmetrical openwork scroll designs.  Approximately 2¼” wide.  The brooch has an older-style long pin and simple C-style catch. Its construction and design suggest an older piece, possibly late 19th to early 20th century, but the exact age and origin are unknown.  The center stone is open-backed and appears deep burgundy to nearly black in some lighting, with rich red/magenta color when illuminated. Stone has not been tested and may be garnet or glass.  Stand not included