1981 Copper Enamel Lincoln Penny Earrings in dark purple.  These lincoln pennies have a dark transparent purple enameling glass that has been sifted in layers and torch fired until the glass has melted and has a glossy finish.  Prior to 1982 every penny the U.S. Treasury minted was 95% copper.  Today pennies are mostly zinc with minimal copper.  The high copper component is what allows this process to be possible.  The high zinc component turns the coin into a melted unusable pile.  

Copper Enameled Lincoln Penny Earrings