Vintage Gold-Tone Filigree and Navy Blue Enamel Square Brooch

This is a vintage square-shaped brooch, likely dating from the 1960s to 1980s. The piece features a gold-toned base metal with a central decorative filigree overlay. This intricate scrollwork is arranged in a diamond orientation atop a Mother of Pearl or pearlescent cream-colored backing. Surrounding this central element is a thick border of dark navy blue enamel, which shows a subtle textured or 'guilloché' style pattern underneath. The construction appears to be a multi-part assembly typical of mid-century costume jewelry. The gold finish is bright, though minor surface scratches and pin-sized spots of oxidation are visible upon close inspection, particularly near the edges. The enamel is largely intact without significant chipping, which is a key quality indicator for well-preserved costume pieces. There are no visible maker's marks or signatures on the front, suggesting it may be signed on the reverse or was produced as part of a high-quality mass-market boutique line. The overall aesthetic combines elements of Victorian revival with mid-century modern geometry, creating a sophisticated and formal appearance.