This piece was bought at an estate sale in Ontario and has proven to be hard to trace
It is a one of a kind hammer gilt metal necklace accented with quartz pieces. It has some weight on it, and is very well-made.
On RubyLane (see https://bit.ly/3lxms45), this was priced by an experienced vintage jeweller at $269. She has noted the date of this piece as circa 1970s.
On GoAntiques (https://bit.ly/3ppFhay), a variation of this piece (a geometric bib instead of a necklace) was dated in the 1930s and was appraised to have jade pieces and not quartz.
I have priced this piece midway, due to the uncertainty of its history.