Vintage black stacked stone & silver bead necklace

This necklace is in excellent preowned condition. The main portion of the necklace is black stacked stones in great condition with silver spacer beads periodically to create a pattern. The portion of the necklace that goes across the back of the neck is silver link chain with a springring clasp. The total length of the necklace is 15.5” plus the clasp.