Birthstone Black Rhodium-Plated Inside-Out Hoop Earrings Night or day, casual or dressed up, birthday or any day, these round hoop birthstone inside-out earrings are great for adding that simple touch of elegance. You'll glow from all angles. A perfect everyday staple. 1 1/2" diameter. Black rhodium-plated. Specify 1 birthstone. Birthstones are simulated gemstones.