Rasendracudamani 12.54

12.54

{jewels:: śodhana}
śudhyatyamlena māṇikyaṃ jayantyā mauktikaṃ tathā /
vidrumaṃ kṣāravargeṇa tārkṣyaṃ godugdhatastathā //

Ruby is purified with acid, and pearl likewise with jayantī; / coral with the group of alkalis, and emerald likewise by cow's milk;