Ratna Pariksha is an ancient science on testing gemstones. It was used by Kosadhyaksha (Superintendent of Treasury) mentioned in Kautilya`s Arthashastra in order to control business of pearl, diamonds and all important gems in the ancient times. It classifies gemstones into Maha-Ratna and Upa-ratna ==History== Ratna Praiksha is mentioned in Kauti....