Vintage 1930s / 1940s Lisner sparkling blue Aurora Borealis silvertone screw back cluster earrings. The earrings feature seven blue AB 5mm faceted stones set in textured silvertone metal. The earrings are signed on the backs with the early "LISNER" mark, which date the earrings from the late 30s to early 40s. Approximate measurements are 3/4" x 3/4".
The AB stones show signs of wear, but it's not obvious except under high magnification. The backs have silver tone loss and corrosion. See photos for details.