The silver ring is made from 94.9% pure silver, which is higher than the 92.5% purity of sterling silver. This makes it a valuable and rare piece of jewelry. Density: Silver is a dense metal, which means that the ring will have a satisfying weight and feel to it. opal exhibits a brilliant play of color that change with the viewing angle a property known as iridescence. This type of opal has an internal three-dimensional structure arising from the regular packing of sub microscopic spheres of silica.