This vintage pair of clip-on earrings is made of pot metal or unpolished steel.  
They have a bright red resin center that allows light to shine through.  
The clips are a silver-tone metal.  
The earrings measure about ½ inch in diameter.  
They are in good condition.
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Vintage Clip Earrings Steel  & Ruby Red, Garnet Red Resin Drop  listed in:
          
            All Vintage Jewelry
            , Vintage Earrings