To express the character or mark of a free style of penmanship by injecting molten noble metals or noble metal alloys with different colors into a groove of the noble metals or the noble metal alloys or into a hole including a through-hole and hardening them.

For example, a groove or a hole including a through-hole is formed in the shape of the character 2 or the mark of the free style of penmanship on the inner surface of a platinum alloy ring 1 by using an inscriber. Then, a single or a plurality of the molten noble metals or the noble metal alloys are injected into the groove of the single or the plurality of non-molten noble metals or the noble metal alloys with different colors or into the hole including the through-hole, and then, the molten noble metals or the noble metal alloys are hardened. In this case, it is required that the melting point of the non-molten noble metals or the noble metal alloys with different colors is higher than the melting point of the molten noble metals or the noble metal alloys or is within the range of 100°C in difference even when it is lower. Unless it is not, a base material metal is molten when the molten noble metals or the noble metal alloys are injected to destroy the boundary line of the character 2. A part protruded from inscription is carved to obtain an initial 2 on the inner surface of the ring by a gold alloy.