Unique glass mosaic necklace with large square pendant by Swoboda from the 70s .  Features square and rectangular cut pieces of marbled jewel-toned glass , set in intricately detailed gold metal . With the maker’s mark on the back of the pendant . The necklace is crafted from small squares of the glass , strung together with small chain links . Edward Swoboda started his jewellery company in 1956 in Los Angeles and was know for using gemstones and cultured pearls .