A stunning art nouveau design necklace featuring beautiful opals and decorated with sparkling marcasite gemstonesopal informationnumber of stones 4stone shape pear oval roundstone size 1 x 12mm x 8mm 1 x 4mm x 3mm 2 x 3mmcarat weight 186ctnaturalcreated natural opalcountry of origin australiamarcasite informationnumber of stones 7stone shape roundstone size 1 x 170mm 2 x 120mm 4 x 110mmcarat weight 010ctnaturalcreated natural marcasitecountry of origi