Using the finite-element method (FEM), glassharp vibration was analyzed. Results show that the glassharp pitch is controllable at the stage of manufacturing. First, the effects of several factors were studied, such as geometry approximation, element type, and the number of division on the accuracy of mode frequencies. Second, it was examined how each mode frequency changes by the fixed position and length of the glassharp stem. The results demonstrate that their influences were of no great importance. Third, the pitch was widely adjustable by changing the swell of the cup. Particularly, it was finely adjustable by cutting a small circular groove inside a bottom of the cup instead of a conventional method.