Large Aurora Borealis Crystal Rose Brooch

This is a large, ornate costume jewelry brooch designed in the shape of a blooming rose. The brooch is crafted from a silver-toned metal, which appears to be a base metal alloy, likely rhodium-plated or similar, given its bright, reflective quality and lack of visible tarnishing in the image. Its physical dimensions are substantial, stated to be over 4 inches long and 5 inches wide, indicating a statement piece. The entire surface of the rose, including its layered petals, is extensively embellished with numerous small, round-cut crystals featuring an 'Aurora Borealis' (AB) coating. This coating creates a distinctive iridescent effect, reflecting a spectrum of colors such as pinks, blues, yellows, and greens, depending on the light and viewing angle. At the very center of the rose, acting as its focal point, is a larger, elongated, faceted clear crystal, possibly a marquise or oval cut, which also appears to have an AB coating or is highly reflective. The construction involves setting these crystals closely together, likely using a pavé or prong-setting technique, into the metal backing. The reverse side, where the pin mechanism would be, is not visible, but a standard pin-back closure is typical for such brooches. There are no readily visible manufacturer's marks or signatures in the provided image. The overall condition appears good, with no obvious missing stones or significant damage. Some minor surface wear or slight dullness on a few crystals might be present but is not discernible from the image quality. The craftsmanship suggests a commercially produced piece, likely from the mid-20th century onwards, especially given the popularity of AB crystals from the 1950s. Its size and dazzling appearance make it a bold accessory.