Bhasma (residue after incineration – calcined preparation) and pishti (powdered gem or metal) are used with herbs for the treatment of critical ailments as a medicinal preparation in Ayurveda and to some extent Unani (both Indian branches of medical science using natural curative methods). The procedures for preparing these medicines are time-consuming and complicated.
Bhasma is a calcined preparation in which the gem or metal is converted into ash. Gems or metals are purified to remove impurities and treated by triturating and macerating in herbal extracts. The dough so obtained is calcinated to obtain the ashes  and result in: