History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c29.1

c29.1

The gems also are regarded as agencies which help the fixation or coagulation of mercury. These are the gems :—*Vaikranta*, *suryakanta* (sun-stone), *hirakam* (diamond), *mauftikam* (pearls), *chandrakanta* (moonstone), *rajavarta* (lapis lazuli) and *garudodgara* (the emerald, lit. derived from the vomit of Garuda); the topaz, the sapphire, the coral, the cat's eye are also reckoned among the gems. These are to be carefully collected for fixation of mercury. 1-3