This is a vintage squash blossom necklace, possibly part of the Fred Harvey collection. We purchased this piece in Dallas TX from a dealer who had a collection of vintage native American jewelry.
Necklace chain measures 17.5" from end to end, the naja measures 3" from the top of the center petal to tip. the petals on the ball chain measure approx 1" long and 5/8" wide.
This is a spectacular piece of history.