One common clarity treatment is laser drilling. An infrared laser is used to drill tiny holes into the diamond near the flaw. Once the laser reaches the impurity, the bad crystal is immersed in a sulfuric acid solution and dissolved away.
Another process often used to enhance the clarity of diamonds is fracture filling. Fracture filling usually follows the drilling process. A microscopic amount of a special reflective glass like material is inserted into the flawed area of the diamond. This material allows light to pass right through the imperfections, making them appear almost invisible.
Clarity enhancement does not necessarily improve the value of a diamond. A clarity enhanced diamond is less expensive than a similar naturally purer stone, but appears just as beautiful. The effects of the treatment processes can only be seen if closely examined under a microscope. Clarity enhanced diamonds are beautiful stones at a more affordable price.
-The Diamond Blog
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