Thank you so much for your reply! I will share this with my mother. They are very special to her and now to me.
I noticed the clasp looks like it is for multiple strands, but in this case only holds one.
And the longer strand is nice because it can be worn long, shortened with a pearl shortener, or worn double around the neck.
Very nice vintage set. Let us know if you need help with how to clean and restring.