These stunning sterling silver art deco earrings feature a mother of pearl gemstone set next to a black onyx stone with a single marcasite stone abovethese earrings use a fishhook and are for pierced ears onlymother of pearl also known as nacre is an iridescent blend of minerals that are produced by oysters and some other molluscsblack onyx is a member of the chalcedony family and has been used in jewellery for centuries most notably in ancient cameo jewelleryonce used as a substitute for