Vintage Beaux Arts fair Metal/Stone-Gem necklace-Putnam Museum in Erie, Illinois For Sale

Vintage Beaux Arts fair necklace-Putnam museum
I purchased this when the fair used to be on the hill behind the Putnam. I remember that the artist was so lovely and it was a beautiful day walking between the trees and in and out of the shade. Miss that so much.
The necklace has never been worn. I do not know what type of metal or stones/Gems it is made of. It includes the little clear bag she put the necklace in for me.
See pictures. Thank you.
Beaux Arts fair artist
Metal/stones/Gems
Pre-Cement walk days.