Black diamonds ornamenting a station necklace with black diamonds are a chic and stylish twist on the style. They provide an air of sophistication and strength to any wardrobe while also adding a bit of color and contrast with the gold or platinum chain that is 16 or 18 inches in length. As a diamond, these stones are a birthstone for the month of April and make excellent birthday gifts, but they add a particularly fashionable spin on the custom diamond necklace.