Serpentine Pendant w Green Tourmaline Gorgeous!

I personally bought this in Ecuador, South America from a friend, Gustavo, who handmade some jewelry for me. And i do mean "handmade", he had a simple workshop w no modern equipment! Very talented man :-) Measures about 2 1/2" without the loop for a chain. I believe marked sterling silver on back (can't find my magnifying glass lol & it's small).