The holes made in the stone are so small that it has to be seen only through jeweler's microscopic loupe. One can spot these holes as very small white dots on the gemstone's surface.
Advantages of Laser Drilling
This method is widely used because it is permanent. The inclusions are removed forever and the durability and sturdiness of Diamond is maintained. The final look with respect to cut and shape does not change.
Fracture Filling
This treatment was also developed during the same time as Laser Drilling. It is used for filling the crack with the transparent glass-like solution. The solution used for concealing the flaws of the gemstone has a very low melting point and refractive index equal to that of diamond. The cracks do exist after the filling but due to the outer optical coating it becomes imperceptible to the normal glance. However, it can be easily noticed under the magnification. Unfortunately this method is not permanent. The specially formulated glass filling can be eroded when the gemstone comes into direct contact with the hot sun. The ultraviolet rays emitted from the sunlight are powerful enough to eat away the filling. Even at the time of routine repairs the heat produced can also lead to glass filling worn out of the gem. The slight heat produced from the jeweler's torch can also melt the filling. Also, cleaning of jewelry having the fracture filled might give the similar results. The glass filling melts at very low temperature.
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