Mid-20th-century style costume jewelry brooch

This item is an oval-shaped costume jewelry brooch featuring a dark, antiqued silver-tone metal base with elaborate filigree-style metalwork. The construction appears to be a multi-tiered design, consistent with mid-20th-century jewelry aesthetics. The central focal point is a larger, vibrant turquoise or teal-colored stone cut into a floral shape, surrounded by concentric rings of smaller circular blue-green rhinestones. The outer perimeter is decorated with twelve prong-set, aurora borealis (AB) finished chaton-cut rhinestones that display a spectrum of greens and blues. The metal displays a heavy dark patina or intentional oxidation to give it an 'antique' appearance. No maker's marks or signatures are visible in the image, so this identification is based solely on stylistic features and construction methods typical of mass-produced costume jewelry likely from the 1950s or 1960s. The piece shows signs of age-appropriate wear, including potential oxidation on the metal and minor dulling of the stones. Determining the exact manufacturer or the specific composition of the metal and stones would require a physical inspection and testing.

Based on my examination of the provided image, I can identify stylistic features consistent with mid-20th-century costume jewelry, likely dating from the 1950s or 1960s. The piece exhibits an oval, multi-tiered filigree design with a central teal-colored floral element and aurora borealis (AB) finished chaton-cut rhinestones. Based on what I can see, the metal has an intentional antiqued patina, though I cannot verify the exact metal composition or the material of the stones without a physical inspection. Because the piece lacks visible maker's marks or signatures, I am treating the attribution as an unattributed 'in the style of' mid-century mass-produced jewelry. The estimated value of $25 - $45 reflects the current market for vintage costume jewelry of this aesthetic and condition. This value assumes the stones are glass or acrylic and the metal is a non-precious base alloy, which is typical for such items. If this were found to be a piece by a highly sought-after designer like Weiss or Eisenberg upon physical examination of a hidden mark, the value could increase to the $75 - $125 range. Conversely, if significant stone loss or lead-rot is discovered upon closer inspection, the value would decrease significantly. To confirm these hypotheses, an in-person examination by a specialist is required to test the stones, check the security of the prong settings, and verify the integrity of the pin mechanism. Generally, there is a stable demand for 'unsigned beauties' in the vintage market, though values remain modest compared to signed designer pieces.