Vintage Turquoise Glass Rhinestone Sunburst Brooch

This is a circular sunburst or starburst style costume jewelry brooch, likely dating from the mid-20th century (circa 1950s-1960s). The piece features a multi-tiered circular design constructed of dark-toned antiqued metal, possibly brass or a base metal alloy with a darkened finish. It is densely set with round, faceted glass rhinestones in a vibrant turquoise or aqua-blue hue, exhibiting an opaque 'milk glass' or frosted quality common in mid-century costume jewelry. The arrangement consists of a central larger stone surrounded by a ring of small stones, with an outer perimeter of larger stones connected by spoke-like metal prongs. The stones appear to be prong-set into the metal framework. In terms of condition, the piece looks well-preserved with its stones intact and no visible chips to the glass. There is some minor surface oxidation or patina consistent with age on the metal settings. The craftsmanship shows typical mass-production qualities of the era, though the intricate tiered structure and uniform stone color indicate a good level of vintage costume jewelry quality. No maker's marks are visible from the front view, but its style is reminiscent of manufacturers like Sarah Coventry or Trifari.