A treatise with instructions for crafting various talismans (thirteen in the Paris manuscript and eleven in the Vatican manuscript). The text details the astrological conditions to be observed in the process, the stone to be chosen and the shapes and magic letters to be carved on it. The two known manuscripts bear different titles and reflect different versions of the same text; both include an additional chapter on testing the authenticity of various stones.

Although its ultimate origin remains unknown, the work is a comparatively old Ptolemaic pseudepigraph, as the Paris manuscript dates from 730/1329. Some 50 years earlier, Baylak al-Qibjāqī (fl. 681/1282 in Cairo) had referenced a book on stones attributed to Ptolemy (cf. Kitāb Kanz al-tujjār fī maʿrifat al-aḥjār, Paris, BnF, ar. 2779, f. 4r:7), but this may also be a different, now lost work. Full titles: Kitāb al-Aḥjār wa-l-kharaz wa-manāfiʿi-hā wa-imtiḥāni-hā wa-ṭilasmāti-hā (Vatican ms); Kitāb Baṭlamyūs fī Manāfiʿ al-aḥjār wa-l-jawāhir wa-tadbīri-hā wa-ṣūrati-hā wa-awqāt ṣināʿati-hā wa-kayfa l-ʿamal bi-hā wa-kayfa tumtaḥanu l-jawāhir wa-ayy kayfiyyat naqshi-hā wa-ṣuwari-hā (Paris ms).