Vintage Costume Jewelry Emerald-Green Glass Rhinestone Brooch

This item is a piece of vintage costume jewelry, specifically a brooch or pin featuring a circular or curved design set with vibrant emerald-green rhinestones. The stones are faceted, round-cut glass, likely simulating emeralds. They are held in place by a gold-tone metal setting, which appears to be base metal with a thin gilded finish. Each stone is secured with a four-prong or six-prong setting, a common construction technique in mid-to-late 20th-century costume jewelry. The metal shows significant signs of age and wear, with visible oxidation and tarnish appearing as dark, crusty buildup between the stones and on the prongs. The gold plating has thinned or worn away in several areas, revealing a duller metal underneath. The glass stones themselves appear relatively clear with some surface scratches and minor dulling, typical of vintage rhinestones. There is no visible maker's mark or signature on the front, suggesting it may be an unsigned piece from a mass-market manufacturer of the 1950s-1970s. The craftsmanship is utilitarian, focused on decorative sparkle rather than fine jewelry precision, as evidenced by the somewhat uneven prongs and the accumulation of environmental debris in the crevices of the setting.