Hadar Designers Necklace Pendant Israeli Jewelry 18? Long Adjustable Down. Honestly we picked this up because the pendant sparkled, was oxidized on back and we were sure it was silver. We have now cleaned it and there is no mark anywhere. It does have a butterfly tag that says HADAR in English and in Hebrew. That part is magnetic so definitely not sterling. The part with the black agate or glass stones is not magnetic but also not marked. The pendant is cool but we have no way to describe it other than it?s about the size of a US half dollar. It?s also not magnetic but again not marked. Much of HADAR jewelry is gold or silver. We are assuming they did high end costume as well and figure that?s what we have. Necklace can be up to 18 inches long adjustable down to 14-15?. Will ship USPS first class with tracking to winning buyer