Sold individually.
It's a subtle look but I love it -- half sterling silver, half 14k gold-filled, you get the best of both worlds in one ring. When you wear one, it looks like the metal mysteriously changes color, fades from one to the other. Stacked together, it's even more interesting, with the colors blending in and out.
Sterling silver and 14k gold-filled, whole sizes available 5-8.