If you are planning to buy a ruby stone, one of the first questions is usually, “What is the price per ratti?” The answer is not a single fixed number. A ruby’s value can vary dramatically according to color, clarity, origin, treatment, size, cut, and whether the stone is natural or synthetic. GIA notes that ruby can command exceptionally high per-carat prices, while differences in color and visible inclusions can significantly change value. For Indian buyers, ratti is a familiar traditional weight used when discussing astrological gemstones. However, sellers may also quote prices per carat, so understanding the relationship between the two measurements is essential before comparing offers.