Mokume Gane is the ancient Japanese metalworking art developed in feudal Japan by master swordsmiths. This is a very technically difficult and time consuming process. The process begins by stacking layers of different colored metals and heating them to 1400 degrees, under extreme pressure, for 10 hours. This allows the atoms from the gold and other metals to fuse together, forming distinctive patterns. The metal is then forged and rolled to set the crystal structure. Finally the gold and other metals are manipulated by twisting and curving to expose the multiple layers, thereby forming unique ring patterns.