Black Hills Sterling and agate pin. The setting is sterling with rose gold flowers and yellow gold leaves. I have seen other Black Hills pins where the gold is 12K but this one is not marked so I'm not sure. It is stamped on the back Sterling L.S.P. These initials stand for L.S. Peterson Co. from Attleboro, MA. The agate has beautiful colors and patterns. Measures 1 1/2" X 1 3/16". Excellent condition.