Abstract: A method of calculating a weight of a gemstone via an electronic device by selecting at least one gemstone characteristic from a list of predetermined gemstone characteristics wherein the device calculates a weight of a gemstone by processing the at least one gemstone characteristic within a gemstone weight algorithm and displays the resulting weight on the electronic device. The gemstone characteristics include a gemstone type, a gemstone shape, a gemstone outline, a gemstone girdle and a gemstone bulge. In addition, a user of the method enters a gemstone size into the electronic device. A user may select in which order he/she selects a gemstone characteristic or enters a gemstone weight and may navigate to and from each characteristic. Once the user selects the appropriate gemstone characteristics, a gemstone weight algorithm performs the appropriate calculations so as to determine the weight of the gemstone.