Vintage filigree brooch with central iridescent art glass cabochon

This is an unauthenticated vintage costume jewelry brooch featuring a central oval cabochon made of art glass or faux stone displaying a dynamic, iridescent play of color with dominant olive green and subtle flashes of blue and red. The central cabochon is bezel-set and surrounded by an intricate, openwork filigree metal frame in a gold-tone finish with textured, twisted wire details forming scalloped looping patterns along the outer edge. The item displays physical characteristics consistent with mid-20th-century costume jewelry manufacturing, showing moderate surface patina and expected age-related wear to the metal finish. There are no clearly visible maker's marks, hallmarks, or signatures discernible in the photograph. The identification is based entirely on the visual observation of the mounting style and materials. Craftsmanship suggests mass-produced or semi-hand-assembled costume pieces popular from the mid-century era, though without physical inspection or visible maker stamps, any specific maker or exact year of production remains unverified.

Based on what I can see in the photograph, this vintage costume jewelry brooch features a central iridescent art glass cabochon bezel-set within an intricate gold-tone filigree metal frame with twisted wire details. Based on visual characteristics such as the construction style, material aging, and moderate surface patina, the piece appears consistent with mid-20th-century costume jewelry manufacturing. However, I can't verify from a photo whether the materials or construction are entirely period-correct, and I would need physical inspection to confirm the metal composition and overall integrity. There are no clearly visible maker's marks, hallmarks, or signatures discernible, meaning any specific maker or exact year of production remains unverified and must be treated as a working hypothesis. My value estimate of $45 to $85 assumes the piece is a vintage mid-century costume item of this general type and condition. General market demand for unbranded mid-century costume jewelry is modest, with buyers typically valuing attractive design and wearable condition. To confirm authenticity and exact age, an in-person examination by a qualified jewelry appraiser would be required, along with potential metallurgical or gemological testing. If this piece were to turn out to be a modern reproduction, replica, or mass-produced copy rather than a mid-century original, the value would likely decrease to the $15–$30 range, reflecting purely decorative or costume utility.