Who the maker of this squash blossom necklace

A friend of mine had been looking for the perfect squash blossom necklace for years and finally found it. She purchased it from a jeweler who said he had purchased it from an estate sale. He didn’t know anything about the maker - it is hallmarked
with the etched initials J.W. and certainly appears to be genuine. Any information about the maker, the quality and origin of the turquoise and value of the piece would be much appreciated. My friend loves it dearly and it would be such a treat to give her more information about it. :pray: