NY necklace black/silver tone jewelry

Necklace is in good condition and kept on a clean smoke free home. 18 1/2” silver tone chain plus 3” extender with 5 silver tone pieces. The front center piece is 1 6/8” round - it does have a very small mark which looks like a rust mark. I am not sure of what it is. The other 4 are not fully round but appear to be because of their position around the center piece. Tag NY is for New York & Comoany. #jewelry #necklace