A Ratti is a traditional Indian unit of measurement for mass. Most astrologers/pundits provide recommendation in ratti weight. In India people generally buy and sell gemstones according to Ratti weight but there is no weighing machine to measure Ratti. Therefore it is strongly advised to buy gemstones only according to Carat weight. Carat is a standard measurement unit.
| 1 Gram | 1000 Milligram |
| 200 Milligram | 1 Carat |
| 182.25 Milligram | 1 Ratti |
| 1 Ratti | 0.91 Carat (Approx) |
| 1 Kachi Ratti | 0.60 Carat (Approx) |
