Ruthenium Plated Sterling Silver Amethyst Cross Pendant Necklace, 18" Gemstones may have been treated to improve their appearance or durability and may require special care. The natural properties and composition of mined gemstones define the unique beauty of each piece. The image may show slight differences to the actual stone in color and texture Ruthenium is a dark gun metal grey color plating Amethyst is February's birthstone Imported