Navajo Wydell Billie Sterling Black Onyx Pendant on SP Choker Native American

Choker style necklace with .925 silver pendant inlaid with black onyx signed: Wydell Billie **** PLEASE READ: I believe the pendant may have been added to the choker, as the pendant is .925 silver, but the choker is silver plated as it has a slight magnetic pull and is not marked. The pendant measures just over 1 5/8" long, while the stone is just over 5/8" long.