Vintage Amethyst and Gold-Tone Three-Stone Brooch or Ring

This item is a circular piece of jewelry featuring three oval-cut amethyst gemstones arranged in a trefoil or clover-like pattern. Each purple gemstone is secured by four metal prongs. The stones exhibit a pale to medium violet hue with clear facets, suggesting they are either natural amethyst or synthetic glass/spinel common in mid-20th-century costume jewelry. The gems are encased in a circular gold-tone frame that features a detailed milgrain or textured rope-like border. One side of the inner frame includes a decorative curved 'leaf' or 'ribbon' element, also in a gold-tone finish. Physically, the piece appears to be approximately 1 to 1.5 inches in diameter. The metal shows significant signs of age and patina, with visible wear to the gold plating, especially on the raised edges and the decorative leaf, revealing a darker base metal underneath. This type of wear is typical for gold-filled or gold-plated costume jewelry from the mid-century period (circa 1940s-1960s). The craftsmanship indicates an assembly-line production style rather than high-end fine jewelry, though the stones appear well-set. No visible maker's marks are present on the front of the item.

I have examined the digital representation of this mid-20th-century circular brooch. The piece exhibits characteristic traits of mass-produced costume jewelry from the 1950s or 1960s. My visual assessment identifies significant 'brassing' or loss of the gold-tone plating, particularly on the ribbon motif and outer milgrain border, which reveals a base metal underneath. The stones, while well-set, show facet-edge wear consistent with glass or low-grade natural amethyst. In the current secondary market for unsigned vintage costume jewelry, demand is driven primarily by aesthetic appeal rather than brand provenance. Comparables for unsigned gold-tone floral or trefoil brooches of this era typically sell within the $30 to $70 range. The value is limited by the lack of a designer hallmark (such as Trifari or Coro) and the visible deterioration of the metal finish. Please note that this appraisal is based solely on photographic evidence. A definitive determination of the stones' composition—distinguishing between synthetic glass, lab-grown spinel, or natural amethyst—would require a refractive index test and microscopic inspection for inclusions. Furthermore, a physical acid test or X-ray fluorescence (XRF) analysis would be necessary to confirm if the metal is gold-filled or merely plated. The absence of maker's marks suggests a standard commercial origin, which significantly impacts the rarity and collector interest.