Vintage 80s Dichroic glass with silver chain earrings

Vintage earrings made of dichroic glass and silver chains. Purchased in early 80s at a artists booth in Atascadero Lakefront Pavilion. The artist said she used genuine silver for the chains. Catches the light very beautifully when worn, rainbows can appear. 🌈 I did purchase brand new backing for these earrings. Approximately 4 1/4 inches long at the longest point