Black jewellery is both, classic yet dramatic and sometimes even gothic.
Black metal is available in different options:
Sterling silver, solid copper and solid brass can be oxidised to a deep black. Copper craft wire is available in a dark grey, gunmetal option.
Black gemstones also come in different varieties: black spinel, black onyx, black agate, black cubic zirconia (looks just like black diamond at a fraction of the price) and others.