A stunning art deco style ring crafted from sterling silver set with a central round black onyx cabochon stone surrounded by sparkling marcasite gemstonesthis traditionally banded gemstone is a member of the chalcedony family and has been used in jewellery for centuries most notably black onyx in ancient cameo jewelleryonce used as a substitute for the shine of a diamond the natural semi precious gemstone marcasite is now celebrated for its lustre and metallic beauty onyx informationnumbe