Vintage Van Dell 1/20 12K GF Serpentine Cabochon Brooch / Pin Mid-Century Signed

This is a beautiful, signed Van Dell oval pin or brooch featuring a unique Serpentine (or Landscape Jasper) cabochon stone. The stone displays a stunning, natural pattern with olive greens and reddish-brown veins. The mounting is clearly stamped 1/20 12K G.F. (Gold-Filled), indicating a high-quality, durable layer of 12-karat gold over the base metal. Van Dell was a respected American jewelry company established in Rhode Island in 1938, known for its superior Gold-Filled designs, making this a true collector's piece from the Mid-Century era (c. 1940s–1960s). Please reference the photo with the penny for size scale.