Anandakanda 1.9.71

1.9.71

vajrasya sevayā yogyo bhavedvajrābhrabhakṣaṇe /
<vajrābhrarasāyanam>
pūrvavanmārayedvyoma vajraṃ vajrāccaturguṇam //

By the use of diamond, one becomes qualified for the ingestion of diamond and mica. / [The Rejuvenative Recipe of Diamond and Mica] / One should incinerate mica as before, and diamond [in an amount of] four times that of the diamond.