Vintage 925 Silver Clip-On Earrings with Black Cabochon 3/4" (1.5 cm) Square VGC

Vintage clip-on earrings Sterling silver (stamped 925) Approx 0.75" square (1.5 cm) with a 0.5" black cabochon in the middle (possibly onyx?) These came to me with an estate collection of items from the 50s and 60s, but I'm unsure of their exact age. In very good condition all around with no damage and no significant tarnish. Clips are functional and secure.