Sterling Silver Multi Shaped Abalone and Marcasite Peacock Style Drop Earrings Sterling silver feather multi shape abalone and marcasite drop earrings. Some Abalone stones are more purple and blue and others are more green and yellow. Each stone is unique. Marcasite can appear iridescent in the light. The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture. Imported