Vintage Sterling Silver Onyx Slide Necklace Pendant ETC9289

This is a vintage, heavy sterling silver necklace pendant set with a large cabochon of black onyx. The pendant measures 1 5/8" wide x 1 5/8" long. It is not signed. Total weight is 28.5 grams. The silver has formed a dark patina that can be removed with silver polish.
This is a vintage, previously owned pendant. Therefore, light wear can be expected. There is no visible damage.