Anandakanda 2.8.62

2.8.62

kulutthakodravakvāthairḍolāyantre vipācayet /
vyāghrīkandagataṃ vajraṃ saptāhācchuddhimāpnuyāt //

One should cook it in a swing-apparatus with decoctions of horse gram and kodrava; / the diamond placed inside a vyāghrīkanda tuber attains purification after a week.