This 925 sterling silver ring features a beautiful large 20x35 Rainbow Obsidian Oval. Handmade by the Artisans of Bali and designed by Marianna and Richard, this is a statement piece. The Rainbow Obsidian has concentric inner colors that reflect outward hints of greens and purples that change from the source of light. Extremely comfortable the ring is designed to fit the finger perfectly with its size. Although sized, the ring is open in the back so it can be adjusted up to a full size bigger.