Vintage Gold-Tone Amethyst Bar Brooch

This is a vintage bar-style brooch featuring a central oval-cut deep purple gemstone, likely an amethyst or high-quality glass paste. The gemstone is secured in a four-prong setting within a decorative, intertwined knot-like circular centerpiece. The metal appears to be gold-filled or high-quality gold plating, showing a rich, warm luster consistent with mid-20th-century jewelry. The horizontal bar extends from either side of the central motif with open-work loop details near the center and solid tapered ends. On the reverse, the piece is equipped with a classic pinstem and a rollover safety clasp mechanism, though the pinstem is currently shown in the open position. The construction suggests a style period ranging from the late Art Deco era to the mid-century modern period (circa 1940s-1960s). Regarding condition, the metal shows minor surface scratches and a light patina appropriate for its age, without significant plating loss. The central stone appears securely set with no visible chips from this angle. While the user mentions a signature resembling 'Park Long,' it is likely a maker's mark for Park Lane, a well-known costume jewelry brand established in 1955, which would align with the craftsmanship and stylistic elements observed.