I purchased these screw-back earrings for $7.50+shipping on Etsy the other week. Not only are they a lovely rhinestone concoction, but they are marked "Duane" - a true rhinestone jewelry score! From what I have been able to gather, Duane made high-end rhinestone jewelry for a very limited time between the late 1940's and early 1950's. Duane pieces are rare and generally expensive! Even though my earrings have some darkened and yellowing stones, there is still a great deal of life and sparkle left, and I have adored them from the moment that they arrived! I also love the way they sit on your ear - a truly unique and beautiful addition to my jewelry box!