Vintage Sterling Silver Amethyst top and Black Onyx Cross Necklace

Vintage sterling silver necklace with a amethyst gemstone in the center surrounded by black onyx. The cross also has marcasites around the onyx and on the bail. This necklace has a chain measured 18 inches long with a pendant measuring 50 mm in length and top 38 mm in width excluding the bail. The necklace is checked and tested for sterling silver and authenticity.