This is (I think) a Fairburn agate from South Dakota. It was part of my grandfather's old bolo tie which he gave to me when I was a child. It has a clasp on the back. Visiting my family in South Dakota was always exciting for my brothers and I as kids. We were city dwellers, and my grandfather's outdoor and farming knowledge always struck me as magical. So I keep this to remember him and that world.
– Don Rice