Secret of the Samurai. Featuring uniquely patterned metalstock styled in the Mokume Gane tradition of Japan, our new M3 line of titanium rings are a modern interpretation of an ancient metal art. Originally created in 17th century Japan as adornment for samurai sword handles and sheaths, Mokume Gane reflects the finest hour of craftsmanship - reproducing the intrinsic beauty of mother nature herself. Pictured at 7.9mm and 9.5mm. Fully rounded edges. mirror finish.