Kautilya's Arthashastra 2.11.39

2.11.39

mārjārākṣakaṃ śirīṣapuṣpakaṃ gomūtrakaṃ gomedakaṃ śuddhasphaṭikaṃ mūlāṭīvarṇaṃ maṇivarṇānām anyatamavarṇam iti vajravarṇāḥ //

The colour of a diamond may be like that of a cat's eye, that of the flower of Sirísha (Acacia Sirísa), the urine of a cow, the bile of a cow, like alum (sphatika), the flower of Málati, or like that of any of the gems (described above).