Good looking pieces, but as it says on the hallmark, it is made in Mexico and is not Native American. You could try a Google image search and see if you turn up something similar. I know that there is at least one Mexican jewelry group on Facebook that might be able to give you some information. I don’t think many of us on here have a whole lot of Mexican jewelry information tucked away in our heads. I hope you find all the information easily and it’s really pretty.
https://www.worthpoint.com/worthopedia/vtg-pichardo-amethyst-necklace-1862232200
Designer, F. RICHARDO, (stamped/marked) 925 TAXCO Sterling Silver Necklace and matching twist screw back earrings set.Made circa 1940’s-1960’s, vintage, F. PICHARDO, designer items.56 grams or 2 ounces total weight of items.Teardrop shaped Amethyst Stones on both Necklace and Earrings.Overlapping Cornhusk style.Others sets have sold for $695/$699.Necklace is 16.5" long, width of each cornhusk is 3/4" wide!! cornhusks are 1 1/4" links sprouting from fine triple strands of silver silk.Earring is close to 1.4" long and 3/4" wide.Earring screws are secure and smooth.Silver could use a polish but I will leave that to the professional or buyer to clean.Stones are intact and secure.Appropriately marked F. Pichardo, Taxco Mexico in circle with the government assay.Unknown if clasp is missing since there is a hooked area at the end that holds the necklace, but not securely.Thank you for looking!