Rasendracudamani 12.21

12.21

{vajra:: puṃvajra}
aṣṭāsraṃ cāṣṭaphalakaṃ ṣaṭkoṇam atibhāsuram /
ambudendradhanurvāri naraṃ puṃvajramucyate //

Having eight edges, eight faces, six angles, radiant,
possessing the colors of rain-bearing clouds, Indra's bow, and water—a male diamond is called "man".