18k Yellow Gold Plated Sterling Silver Genuine Amethyst and Diamond Accent Heart Dangle Pendant Necklace , 18" 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. Amethyst is February's birthstone. All our diamond suppliers confirm that they comply with the Kimberley Process to ensure that their diamonds are conflict free.