For your consideration in this lot are two Navajo made Montana dendritic agate sterling silver rings. The first ring has a horizontal oval of Montana dendritic agate on a split sterling silver band marked ‘925’. The black branch-like dendrite inclusions are made up of iron oxide or manganese. The "branches" in this ring look like the scrub sage of the Montana prairies. This ring is U.S. size 9.5. The next ring has a vertical oval of dendritic agate with red/brown branch-like dendrite inclusions of iron oxide or manganese. The "branches" in this ring resemble the fall colors of the cottonwoods. This ring is on a solid sterling silver band, U.S. size 9.5, marked ‘925’.