Vintage MultiStrand (20 Strand )Black and Clear Crystal Beaded Necklace

Round black seed bead strung with clear 'bugle' looking beads with silver tone descending spherical ball chain/clasp. It has a hook/eye clasp.. unsure of its proper name. Approx. 20 1/2" long, Feminine Necklace that catches and reflects the light. 20 strands. no mark or maker. It was my aunts, she thinks she bought it in 1980's at B Altmans in New York.