Not all diamonds are pure. As diamonds originates from carbon, some of them are embedded with carbon that they encounter at different stages of development while making its way up to the Earth’s surface. The black carbon remains to be seen under magnification and even to the naked eye even after the rough diamond is cut and polished.

A way has been developed to treat this flaw – laser drilling. This method of drilling into the diamond using a laser beam was developed in the early 1960s by General Electric. The laser beam that has a diameter that is 100 times smaller than a strand of hair creates an entrance into the carbon. The diamond is then boiled in acid under high pressure and the acid which reaches the carbon through the laser-created entrance “bleaches” the carbon white.

Contrary to common beliefs, the carbon is not actually removed, it is simply changing what could be seen by the naked eye.

The process of laser drilling to improve the diamond’s clarity is considered permanent and does not alter the diamond’s carat weight at all. Sometimes even the perceived color drops a grade. This is because there is no more contrasting black spot present in the diamond to absorb the diamond’s natural color.

Diamonds are the hardest element on earth, and laser drilling does not affect the stone’s durability.

The GIA considered laser drilled diamonds to be permanently treated. Unlike the enhanced diamonds by fracture filling enhancements, which the GIA does not consider as permanent. Thus, contrary to its policy of not offering grading reports on enhanced diamonds, the GIA offers full grading reports indicating that the diamond is laser drilled.

It is quite amusing to note that jewelers are more acceptable to the concept of clarity enhanced diamonds as opposed to laser drilled diamonds because it seems that they feel that the diamond has somehow become impure by drilling. The truth is, the laser drilling process actually allows the diamond to enjoy its true brilliance without any visually disturbing carbon.

For more information on this topic visit our Diamond Education & Resource Center

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