Heart Shaped Copper Enamel Earrings. Copper hearts were sifted with layers of pink enameling frit (fine glass) then torch or kiln fired until glossy. Next a stencil is used to sift a complimentary color (grape) glass onto the surface then fired again until glossy. You can't go wrong with swarovski crystals to add just the right amount of bling! Sterling silver ear wires.