Vintage Native American Navajo coral and silver ring

Old! A lovely setting with a shadowbox surrounding nice piece of coral. The coral does have a crack, but the setting is holding and very permanent. The ring weighs 7.8g. There is no makers mark or sign of sterling; however, this generally means the piece is very old and has been worn over the years. The coral measures 7/8”. Ring size is 7. Nice addition to a lover of Southwest jewelry.