Kautilya's Arthashastra 2.11.37

2.11.37

sabhārāṣṭrakaṃ tajjamārāṣṭrakaṃ kāstīrarāṣṭrakaṃ śrīkaṭanakaṃ maṇimantakam indravānakaṃ ca vajram //

Sabháráshtraka, that which is found in the country of Sabháráshtra; Madhyamaráshtraka, that which is found in the Central Province; Kásmaka, that which is found in the country of Kásmaka; Sríkatanaka, that which is found in the vicinity of the mountain, Vedótkata; Manimantaka, that which is found near the mountain Maniman or Manimanta; and Indravánaká are diamonds.