I purchased a Navajo belt buckle a no. of years ago, It is of an Indian warrior with a lance mounted on a horse and is made of silver, onyx, and turquoise with the initials J H surrounding a plant on either side. I am interested in finding more about it. I also gave my wife a pendant about 15 yrs ago. It has the initials FY on it. Might this be a Frank Yellowhorse piece? If so, are these valuable tioday?