the design look pretty retro modern, which would placeit in the 40s to 50s, possibly late 30s but basically mid 20th century, imho
One way to help judge quality is to look at the way the stones are set and what the metal is they are set into
The best early pieces tend to be silver set and have prong set marcasites - so much more work involved in the manufacture
It is difficult to date this precisely but I would lean towards it being quite late - maybe 80's ??
I am not seeing any prongs - looks like the marcasites are glued
Have you ever heard or seen about bead set stones?
I can't tell for sure, but it looks to me as though that is how you stones are set. It was a pretty common way to set marcasites. You have to look very closely because there are some pieces that are what I would call faux bead set. That is where small beads are present in the setting, but are not holding the stones, but give the appearance that they are. 954 could be a silver content mark or it could be a the number of the design for this piece. If this is a bead set piece my guess on the age of the piece would be mid-50s based off the setting and the shape of the safety clasp. If this is a faux bead setting my guess would go to the mid-80s. Judith Jack came out with quite a few marcasite jewelry piece in the mid 80s that were very popular. Her pieces were generally marked. Because they were popular, there were others that also came out with marcasite jewelry. Because they followed a lot of the vintage designs and construction practices, marcasite pieces are hard to date. Hope this helps.
