The listing, Opal & Silver Ring! has ended.
An eyecatcher! This is an opal triplet, which means it's a thin slice of opal sandwiched between a backer and a crystal. All the beauty at a fraction of the cost! The setting (closed back) and ring are silver. The silver isn't stamped .925, but it does have a jewelers stamp of "KG". I couldn't get a pic that really showed the color, but it's mostly a blue/green with flashes of orange/red in the light.