This vintage necklace is a Flapper style strand--a full 56" long--made of knotted, cut-glass jet black bicone beads.
The black cord is thick and durable, the weight of the beads pulls it smoothly when the necklace is worn. And you have options: Long and loose, knotted at any point, double or triple wrapped around the necklace, or even pulled to the side/accented with a brooch.
The beads are in very fine condition with no obvious chips or cracks; there is the expected light wear along some of the mid-points (really only visible under magnification or very bright light).
The clasp is a gold-tone spring ring. These beads have sharp facets and polished planes so they reflect a lot of light!