Miriam Haskell Necklace/Earring Set

by Ken
(Northern CA)

Greetings!

I'm wondering what date this might be from and what a general appraisal value might be. It's signed on the
back of the earrings, on the screw-in clips. On the
necklace, it's signed on the back of the clasp, and on
the back of the pendant. I really love the way the delicate little maple leaves entwine around the glass beads. Is the metal part Russian gold?

Thanks very much for your help,

Ken