Vintage Screw On Earrings Unusual Silver Tone with Gems 1" Statement

Vintage Screw On Earrings Unusual Silver Tone with Gems 1 Statement  These earrings measure just under 1. Design on one leans to the side slightly. I am unsure of the material of the gems. Tops ones are clear but bottom ones are a smokey grey tone but one is darker than the other. Design on front part has a circular line through it - not sure why. Some tarnish to rear. Some marks and signs of wear.  Preowned vintage earrings, sold as shown - I am unsure of material type(s) because of this. Pictures show different angles for you to review - while I attempt to note any defects, some tarnish/signs of wear may be visible that are not otherwise stated.  Earrings are tested and photographed on a thin/smooth earring stand (not included) to show that they are in working order.  If you have any questions please feel free to drop me a message.