These are remarkable beads from my own collection and I have loved them! I am fond of beads. Some are not there with beads but these are so wearable and dramatic in a simple way! Each of the 17 molded black glass beads is 5/8" long by 1/2" wide. They are round so they lay up from the skin. Each has a filigree bead cap in gold tone on either end. I see I restrung this on sturdy beading wire and added an extension. It still has it original jump rung.
The wearable length of the necklace with the full extension is 20 1/2" long. At shortest, it would be 17 1/2".
I think these are around the 1920s, making an educated guess.
They are great beads for stacking. That what I always have done when wearing them!