Here is your basic, go-to, pearl bead necklace / choker. The faux pearl beads are mid-century Japan, just taken from the package this year (2018). The pearl bead size is 3mm or so. They can vary slightly in size.
It’s finished with silver plate findings, including a lobster clasp, on steel cable.
I also have a similar item in the shop with 2.5mm (slightly smaller) faux pearl beads, also mid-century Japan.