CORO Vintage Blue Rhinestone on Silver Tone Clip-on Earrings

Vintage CORO Blue Rhinestone on Silver Tone Clip-on Earrings. There are stains on the front & one back of one of the earrings. I have not cleaned these as I normally don't do. I have always let the new owners do the polishing and cleaning. Other than those 2 spots, as seen in pictutes, they are in pretty good condition for their age. The hallmark was hard to photograph, but I did my best, as you can see in the last picture. TA065