Beautiful green turquoise ring size 8 unisex

rustic appearing green turquoise approximate ring size 8. silver is not marked and I don't know how to test for sterling but this looks to be an old authentic southwestern?native American ring due to the stamping and look of the ring. please see unfiltered photos. natural patina. natural inclusions with brown matrix. this appears to be a one-off ring. I have a large turquoise collection and need to let go of some beautiful pieces and hope they find a good home.