What is the ruling on hanging Quranic verses in necklaces and the like and selling them, and selling bracelets in the form of a snake's head?

It is not permissible to hang Quranic verses on jewelry chains and the like, because this may lead to the degradation of the Quran and touching it while in a state of janabah, menstruation, or minor ritual impurity. It is also not not permissible to sell bracelets in the shape of a snake's head.