Vintage 10k GF carved shell cameo brooch with rhinestone border. 2” Italy c1940

This particular cameo, framed with rhinestones and set in a gold-tone metal, points to it being a piece of costume or fashion jewelry, likely from the mid-20th century. While not made of precious metals or gemstones, these pieces were widely produced and collected for their aesthetic appeal and historical echoes of earlier cameo traditions. The Amedeo brand, mentioned in the search results, is known for its fashion jewelry, often incorporating vintage-inspired designs.