While I love many different Eras of Vintage and Antique Jewelry, I like to acquire pieces that are unique. There are indeed, similar design themes observed when hunting and collecting for vintage jewelry. So, I very much like to look for pieces that I love and that aren't the typical design you would see from an certain Era, Culture or particular designer.
Here is a Native American Agate Ring. I had in my mind to look for a large, unique cabochon Turquoise ring. I like larger, bold designs. While there were many Turquoise rings with good design there wasn't anything that really "popped" for me. Then I saw this ring and I was really "Taken" so to speak.
I believe it is pre-1950's and could be as early as the 20's or 30's and Navajo. Will have to do a bit more research for sure.