Thoughts on artificial bodies

Hanuman, known also as 'Anjaneya' is one of the most popular concepts of devotees of God. He is also referred to as Bajrang Bali because his body was hard like a diamond. Recently one guy from Maharastra,India became popular and considered as Hanuman rebirth took place. The reason for considering him as a Hanuman is if you hit his body with a spoon it sounds like your hitting an iron rod. Personally as a science student I don't believe this. But what puzzles me is when can a body become as hard as an iron rod? what made his body different? Is it gene related?