Ratna Pariksha

is an ancient science on testing gemstones. It was used by the Kosadhyaksha and mentioned in Kautilya's in order to control the trade of pearl, diamonds and all the other important gems in antiquity. It classifies gemstones into and .

History

Ratna Pariksha is mentioned in Kautilya's . Vātsyāyana, the author of the Kama Sutra also mentions. The method was also studied by princes in Karnataka during the medieval period.
The author of the treatise is very commonly known to be one Buddha Bhatt. There is also mention of another author in the medieval period, Thakkar Pheru, who is again credited with having worked on this subject. There is a mention of one Vaidyaraj Shri Radha Krisha Navetia who uses for preparing a type of alcohol meant in the use of gem refining.