One cone is stamped BRASS and what looks like initials IG. This is strung on cord and there are tiny shell heishi between the largest turquoise next to the bead and then again 1/2 way up on both sides this is done again. There are little nicks and bites but nothing that stands out. It's a great looking necklace.
I'm sure the extender is a later addition and the metal is silver tone. I didn't test it. Please check with your country?
The item "Old Vintage Graduated Green Turquoise Heishi Necklace w Big Brass Stamped Bead" is in sale since Tuesday, July 16, 2019. This item is in the category "Jewelry & Watches\Ethnic, Regional & Tribal\Native American\Unsigned Artisan Jewelry". The seller is "jewelryjoy" and is located in Las Cruces, New Mexico. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Iceland, Sri lanka, Uruguay, Russian federation.