I bought this necklace from a Hill Tribe lady in Chiang Mai, Thailand. While it appears to be slightly tarnished silver, it slightly attracts a magnet, so the core, at least, is not silver. Still, it's a unique looking item that is hand-made by a cute little lady from the hills of Thailand.
Length of chain is about 23". Diameter of the circular portion of the pendant is just under 1-3/4".