From the Hill people tribe in Thailand, this is an etched silver collar used in ceremonial practices. Do some research like I did this patinas like full silver vs mixed alloy with silver. This is the third one I’ve ever found in 43 years, was once owned by a native of the area brought back to the states and handed off down the lineage line. These are absolutely stunning. My personal one I’ve had since I was 15 years old, I took off all the dangles and wear just the collar plate and made earrings and other pieces from the rest. If I wasn’t trying to find for a trip this would stay in my collection, trying to downsize. At one time these were a status symbol of wealth and prosperity.