vintage-style marcasite brooch in the shape of a butterfly

This decorative costume jewelry piece appears to be a vintage-style brooch fashioned in the shape of a butterfly or bow, displaying physical characteristics consistent with mid-20th-century mass-produced accessories. The item is constructed from a dark silver-toned base metal, featuring elaborate openwork filigree details and an oxidized finish designed to accentuate the texture. The surface is densely pavé-set with small, reflective marcasite or rhinestone stones across the wings, while larger faceted dark grey stones form the central body of the insect motif. Regarding condition, the piece shows minor surface wear and a typical aged patina on the metallic framework, though no major structural damage or missing stones are immediately apparent from the photograph. There are no visible maker's marks, hallmarks, or signatures discernable on the front side presented. Because the piece lacks any legible stamps or verifiable documentation in the image, the identification is hedged entirely on its visual appearance and stylistic elements rather than a known manufacturer. The overall craftsmanship displays typical stamped metal techniques and stone-setting methods common in vintage costume jewelry production.

Based on what I can see in the provided image, this decorative costume jewelry piece appears to be a vintage-style brooch fashioned in the shape of a butterfly with a dark silver-toned base metal, openwork filigree details, and pavé-set marcasite or rhinestone stones. I cannot verify from a photo the exact metal composition, the gemstone identities, or the presence of any concealed maker's marks on the reverse side. A physical inspection would need to be performed to determine whether the metal is sterling silver or a base metal alloy, and whether the stones are genuine marcasite or glass. The estimated value range of $45–$85 assumes that the piece possesses the stylistic characteristics and materials typical of mid-20th-century costume jewelry, and that it is in the general condition observed with minor surface wear. Demand for vintage marcasite and costume brooches remains steady among collectors of mid-century accessories, though values generally reflect decorative and nostalgic appeal rather than precious metal or gemstone worth. To fully evaluate and support this valuation, an in-person examination by a qualified appraiser, hallmark verification, and potentially specialized testing would be required. If further inspection reveals that this item is a modern reproduction, replica, or made 'in the style of' vintage pieces rather than period-authentic, the market value would likely decrease to a lower range of $15–$30.