Vintage shades of blue chip stone bead necklace

metal toggle closure silver tone round beads at each end small stone chip beads-cold to the touch colors-shades of blue, white, gray, green etc. on thread vintage 19" length worn a few times. Was my Grandmother's. Noted flaws-natural pitting on the stones. Some copper color coming through metal on clasp. You can see the blue thread. This necklace due to being on thread, has a delicate feel to it. Otherwise, good condition.