This unique art deco style necklace is crafted from sterling silver and features three iridescent opal gemstones surrounded by marcasite gemstones once used as a substitute for the shine of a diamond the natural semi precious gemstone marcasite is now celebrated for its lustre and metallic beautyopal informationnumber of stones 3stone shape roundstone size 1x 3mm 2x 250mmcarat weight 017ctnaturalcreated natural opalmarcasite informationnumber of stones 31stone shape roundsto