Turquoise Jewelry or Native American Jewelry artists. We may not have the Artist or Hallmark listed that is on your jewelry. If we do not, please consult the book: "Hallmarks of the Southwest"
But there are links on this thread to books on the topic, to helpful pages of hallmarks, to suggestions that you check eBay for similar items [adv: item on eBay], plus some general hints that silverplate probably has no value. So I'd suggest reading the previous entries rather than wait...