Vintage Midcentury Light Blue AB Rhinestone Brooch

Cute flower brooch, pale blue rhinestones I believe to be aurora borealis due to their iridescence. Really unusual colors. Photographed in a couple different light settings to demonstrate their beauty. Intricate beaded and hatched silverwork. Unknown metal. Unsigned. Very good condition. no missing stones. Very shiny all the stones are highly reflective, not at all dulled over time. Well-made, sturdy, probably an unsigned designer. about an inch and a half across. This belonged to the mother of my friend, who currently 80 years old. Her mother was a buyer for Lord and Taylor, New York, 1930s-40s, she had a few beautiful brooches she wore for work. This brooch was certainly purchased in New York City.