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.