A stamp ring taking the form of an antique coin. Made with the original materials—iron, gold, and platinum— Kigawa tried to recreate Seiha Ogawa's work as faithfully as possible. The jewelry finally took form after many trials and errors shaping the iron and hand-carving the inner contours. While the original surface material (iron) of the ring is retained, it is given a fresh look with hexagonal pattern by hand-engraving.