Abstract: An improved gemstone measuring apparatus includes a pair of linearly aligned measurement flanges used to determine the linear dimensions of a gemstone alone a plurality of axes. One of the measurement flanges is linearly moveable relative to the other. A measurement member translates the distance between the measurement flanges to display indicia responsive thereto. A rotatable support platform is coupled to the housing intermediate the measurement flanges, the axis of rotation thereof being co-extensive with a measurement flange. The gemstone whose dimensions are to be measured is disposed upon the rotatable support platform intermediate the measurement flanges. The rotatable platform is positioned to align the gemstone axis being measured with the axis of alignment of the measurement flanges.