Vintage Costume Brooch with Blue Rhinestone Centerpiece

This item is a circular, sunburst-style vintage costume brooch, approximately 1 to 1.5 inches in diameter. The piece features a central, multi-faceted round-cut light blue rhinestone (resembling aquamarine or blue topaz) set within a raised white or cream-colored enamel disc. This center is framed by an ornate gold-tone metal filigree border composed of repeating scrollwork and decorative scallops. Radiating from this border are ten tiered, star-like points, each terminating in a small, prong-set clear or pale rhinestone. The metal shows significant signs of age, including a dark, irregular patina and visible oxidation, particularly on the outer prongs and filigree channels. Some of the smaller perimeter stones appear dull or darkened, possibly due to adhesive deterioration or foil damage. The construction suggests affordable mid-20th-century costume jewelry, likely dating from the 1950s to 1960s. The pin stem is visible protruding from the side, suggesting a standard safety pin clasp mechanism on the reverse. No maker's mark is visible from the front view, but the craftsmanship indicates mass-produced fashion jewelry of the era.

I have examined the provided images of this circular sunburst-style vintage costume brooch. The piece is characteristic of mass-produced fashion jewelry from the mid-20th century, likely dating to the 1950s or 1960s. The central light blue rhinestone and surrounding clear accents appear to be glass or acrylic, consistent with the 'costume' designation. My assessment of the condition reveals significant hurdles for collectors: the gold-tone metal exhibits heavy patina and oxidation, and several perimeter stones show signs of 'deadness' where the foil backing has deteriorated. The market for unsigned, mid-century costume jewelry is currently saturated, and value is primarily driven by condition and 'wearability.' Because this piece shows visible age-related damage and lacks a prestigious maker's mark (such as Trifari or Coro), its value is decorative rather than investment-grade. Comparable items in similar condition frequently sell at estate sales or online marketplaces for under $30. Authenticity as a period piece is supported by the construction and stone settings, though I must note that visual inspection alone cannot confirm the base metal composition or the presence of lead-based solder. A physical examination would be required to test the stones for material density and to inspect the reverse for a 'hidden' maker's mark or signed clasp. Provenance documentation regarding its original purchase or previous ownership would be necessary to elevate its historical significance beyond a common decorative accessory.