Czochralski crystal pulling process is invented by Jan Czochralski and commercialized in the 1960’s.  It is most efficient and progressive method for obtaining high-quality & nearly flawless stones. It is also a mature technique with high optical & structural quality of gems; with uniform colouring along the whole crystal.


Czochralski crystal pulling process is rather expensive, as the crucibles are made of precious metals like Iridium. Growth rate is lowered to suppress the bubbles; it takes 2-3 weeks for crystal growth.  The process can grow single crystals of a given crystallographic orientation, without any deviation of the growth axis. High temperature gradients in the melt results in the stability of a smooth crystallization front. Growth of the crystal from the melt occurs without contact with the walls of the crucible that allows setting the geometric shape, by varying the melt temperature & pulling rate.  Czochralski crystal pulling process method produces crystals with low inner stress.



Czochralski Crystal Pulling Process


LifeGem uses rough stones made from this process for Ruby, Alexandrite, Spinel, Chrysoberyl and Forsterite.