Abstract: A process for shaping or preparation of a preform cone of desired shape and dimensions including diameter is provided. The process is characterized by preparing the preform cone either at the mother preform stage or at daughter preform stage without requiring the step of heating the preform end of the mother preform or the daughter preform to a very high temperature and without requiring a step of cooling of the preform cone thus prepared wherein the preform cone is prepared by cutting the preform end or shaping the preform cone at one end of the mother preform or daughter preform by employing a high pressure water-jet. A mother preform and daughter preform having preform cone of desired shape and dimensions, and optical fiber produced from said mother preform and said daughter preform are also provided.