Twisted Marcasite Crystal Pendant on 925 Sterling Silver 17.5" Chain Necklace

Twisted Marcasite Crystal Pendant on 925 Sterling Silver 17.5" Chain Necklace. Pendant has two markings I can't read. I don't believe there is a 925 mark, but the pendant is not magnetic. The chain is marked 925 Sterling. Pre-owned, this necklace is in excellent condition.

N467