Sterling Silver Round Solitaire Cubic Zirconia Bezel Ring

Sterling Silver Round Solitaire Cubic Zirconia Bezel Ring Size 5.5-6 Baguettes also CZ I’ve had this ring for a while. The metal was a bit of a mystery before because inside the band it faded but never showed signs it’s plated. I polish and clean it just like sterling and it never tarnishes or turns finger green. Stamped 925. Still shines beautifully when polished but the tone in metal looking a shiny gray. So it will NOT turn. See last photo after using sterling silver polish cloth