Vintage Clip On Earrings Rounded Square Mother of Pearl?

Description

These earrings measure about 7/8". Not sure of material looks like a dark mother of pearl but I cannot be sure. Some variation in the color between the two earrings and in some lights one appears darker than the other. Some glue visible and marks visible to rear. 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 the clips are in working order. If you have any questions please feel free to drop me a message.