This ring is made with sterling silver and sunstone. Sunstone is a pagioclase feldspar or a clear sort of quartz that has mica and minerals (like hematite) in it. With this ring design, it looks like a symbol of a run rising (or setting) from over a hill. I haven’t heard much about sunstone, but it’s actually the official gemstone of Oregon.
You can buy this sunstone ring from the Liquidation Channel