Treated Color Diamond Facts Worth Knowing

Treated Colour Diamonds

Diamonds are made of carbon. Beneath the mental of earth diamonds take thousands of years to form. And sometimes mixing of other elements gives a diamond a distinct color. These color diamonds are very rare. The proportion of other components determines the strength of color. The color of a slightly tinted diamond is not that intense and hence to enhance the color the diamonds are treated in manmade laboratories. After which natural diamonds are known as treated color diamonds. Some treatments can improve the color & clarity of the diamond.

The very first instance of treating a natural color diamond is on the name of Sir Williams Crook, an English chemist. In 1905, Sir Crook exposed diamonds to radioactive elements and discovered that one can change the color of a diamond permanently.

Some of the Color Diamond Treatments

1. Ink Staining

During ancient times, to enhance the color of diamond ink staining method was used. People used to coat diamonds with colored ink. But this option was not long-lasting, because the dye used to fade with the use of diamond. But still, it was one of the most used methods of that time.


HPHT stands for high pressure, high temperature. HPHT imitates the natural process that creates diamonds. By giving higher pressure and temperature it is possible to intensify the color of diamonds such as yellow, blue, pink, green, etc. HPHT is even used for a colorless diamond. Natural colorless diamonds sometimes tend to have a yellowish tint, which pushes them down on the color scale. Through the HPHT diamonds, the color grade can be improved.

3. Surface Coating

The coating can enhance the color of the diamond by covering the surface with a very thin layer of chemicals or plastic. Another form of coating is to apply a thin layer of lab-grown diamond to the surface of a diamond, but that can diminish the properties of natural diamond.

4. Laser Drilling

The laser drills small holes in the diamond and ignites the inclusions or creates channels through which bleach can be inserted to enhance the color. It can even ignite inclusion.

5. Irradiation Method

Irradiation is a process in which particles, usually no larger than electrons, are thrown into a diamond. This process changes the physical properties of the diamond and, then the diamond is heated in a process called annealing. In this process, atoms rearrange themselves and produce the desired hue. Irradiation permanently changes the color of diamonds at the subatomic level.

How to Find Out if the Diamond is Colour Treated?

Two methods are available to check the status of the diamond whether it is treated or not. One is color zoning; it shows if color enhancement is used or not. Another one is spectroscopy.  One can know the origin of color, via this procedure. Spectroscopy is performed in laboratories only.

There are some points one should keep in mind. Ultrasonic cleaning cannot be performed on Treated diamonds. After treatment, the brilliance of the diamond can be affected. But still, Natural color treated diamonds are one of the best ways to get desired color diamond at affordable prices.

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