Vintage raw stone turquoise best ring

This ring best is a size 9 the color of the stone can range anywhere from a blue to blue green depending on the type of light that hits it. the silversmithing is absolutely gorgeous it's very comfortable to wear and the underlining mother stone is black so it's very pretty ring. You can tell that the ring was worn a lot from the wear on the inside of the ring but it's nearly perfect on the outside it's signed TDA . It's sterling but not marked