Wow, what a combination on these very classy vintage beads.  This is a single strand of beads that is shown doubled over, made of grey translucent beads with swirls of white that are set in groups of three amid flat rectangles of beautifully iridescent mother of pearl shells.  Added to these are tiny rhinestone roundels each bordered by two gold fluted spacer lentil beads all strung on string.  This lovely necklace is joined with a threaded barrel clasp.  With just the right combination of subdued and sparkle, they measure 30" long.

Full view of beads: