Iridescent Aurora Borealis Glass Bead Necklace

This is a vintage-style necklace composed of iridescent glass beads. The beads are graduated in size, with smaller beads near the clasp and gradually increasing in size towards the center of the necklace, creating an elegant drape. The material appears to be glass, possibly a type of 'Aurora Borealis' coated glass often seen in mid-20th century costume jewelry, as evidenced by the vibrant, rainbow-like shimmer visible on each bead when light hits it. The primary color of the beads themselves is a translucent clear or very pale hue, with the iridescence providing flashes of pink, blue, green, and yellow. The beads are strung on what appears to be a light-colored, possibly off-white or yellowish thread, which is visible between the beads, suggesting a traditional hand-strung construction. The clasp is a box tab insert clasp, dark in color, suggesting it could be tarnished metal (possibly silver-toned or brass) with an intricate, possibly floral or filigree, design on its surface. There are no obvious signs of significant damage like chips or cracks on the beads, though surface wear common with age and use might be present but is not clearly visible in the image. The overall condition appears good given its potential age. The craftsmanship seems consistent with mass-produced costume jewelry of the mid-20th century, likely between the 1940s and 1960s, a period when such iridescent finishes were very popular.