Vintage Gold-Tone Enameled and Rhinestone Butterfly Trembler Brooch

This is a decorative butterfly brooch, likely of vintage costume jewelry origin, possibly dating from the mid-to-late 20th century. The piece is constructed from a polished gold-tone metal alloy, showcasing intricate openwork wing designs with fine wire-like radial lines. It features a "trembler" or en tremblant mechanism, where parts of the butterfly (likely the inner set of wings or decorative elements) are attached to tiny springs, allowing them to move when the wearer is in motion. The brooch is embellished with approximately 20-25 round-cut clear rhinestones, pave-set in circular mounting points across the body and upper wings. The outer edges of the wings are accented with a rich ruby-red enamel, and the lower wings terminate in elegant teardrop-shaped tails. The antennae are textured and tipped with small gold-tone beads. The condition appears to be good with minimal signs of wear; the metal finish remains bright, the enamel shows no visible chipping, and all stones appear present. While no maker's mark is visible from the top view, the quality of the casting and the mechanical assembly suggests a mid-range costume jewelry manufacturer such as Coro, Monet, or Trifari from the 1960s-1970s. The piece is presented on a white fibrous display pad within a dark grey or black jewelry gift box, which includes a white string tag, indicating it is likely being prepared for sale or appraisal.