Gem cutting is a technique that establishes the best cutting strategy, which can be described as the extraction of the largest gemstone with the highest gemological value from the rough volume. Professionals observe the unique configurations of each gem based on his or her tacit knowledge and identify the position of structures, such as inclusions, cracks, and cleavages, as well as color zoning, which are aspects that impact product market value. The results of these observations are inconstant since the task is carried out based on the knowledge and experience of the professionals, which vary from one individual to another. Thus, an auxiliary tool for gemstone cutting projects is proposed that virtualizes the processes of observing high gemological value gemstones and their preform positioning. A bibliographical review of the technical and technological requirements of lapidary cutting is presented, as well as a description of suitable technologies for three-dimensional digitization and analysis. The gathered information guided an experimental research study, which started by acquiring the internal and external morphology of three imperial topaz samples using computerized microtomography and digital image processing. The interactive manipulation of a parameterized preform allows the amount of wasted material during the preforming phase to be measured, thus concurrently establishing the basic dimensions of a mass suitable for cutting. Such data enables the creation of several faceting projects on the software that preserves the material until the ideal cut is established, which is a beneficial strategy for high gemological value materials. The digitized volume error was 0.1179. This index was obtained by comparing the digital volume of the material to the volume of its physical sample as measured by a hydrostatic scale. A specialist completed a visual inspection that evaluated the outer surface of the gem and determined that it was a reliable cut except for the top areas and those that were in contact with the specimen holders. Nevertheless, the identified problems are not relevant since gem cutters commonly disregard the mentioned areas at the beginning of gemstone conformation. The minimum pixel size reached by microtomography analysis was 1.3350 um, which prevented smaller structures from being captured.