1950 VINTAGE brilliant crystal earrings

1950’s beautiful crystal screw on earrings. excellent vintage condition. the rhinestone in these earrings is Aurora Borealis is an iridescent rhinestone finish developed by Swarovski (a maker of fine rhinestones and Austrian crystals still in business) in 1955. These rhinestones were widely used in costume jewelry manufacture in the late 1950s and early 1960s in numerous colors. They are sometimes misattributed to earlier beads made with an iridescent finish or referred to as carnival