Ruby and diamond brooch in 18K yellow gold featuring mystery-set ruby hat design with diamond accents and figural bow detail. Convertible design functions as brooch or pendant, measuring 1.4 x 0.8 inches and weighing 8.76 grams.

The 18K yellow gold mounting showcases whimsical hat motif with invisible-set rubies creating smooth continuous surface across the hat's curved form. The mystery-setting technique conceals metal framework beneath calibrated square-cut rubies, allowing stones to appear seamlessly joined without visible prongs. A single row of diamonds outlines the hat's brim and decorative band, adding sparkle and definition to the design. The ornamental bow features white gold or platinum construction set with diamonds in floral and scrollwork patterns, creating contrast against the yellow gold body. A hidden bail behind the hat allows conversion from brooch to pendant functionality. The secure pin mechanism on the reverse enables wearing as traditional brooch on lapels or scarves.