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The diamonds are bright and have a variety of different colors, showing different visual styles, which are very popular, but in the beautiful world of colored diamonds, there is a quite unique kind, that is, "chameleon diamonds". Diamonds can change color as temperature or light changes, which is extremely interesting.
Discovery about chameleon diamonds
The documented "Chameleon Diamond" was first discovered in a small mining area in Southeast Asia in 1943. It was discovered that a dark green diamond placed on a hot polished turntable gradually turned yellowish green and placed in a jewelry box. After a while, the diamonds returned to dark green, and since then a small number of diamonds have been found to have this characteristic. It was later named after the "Chameleon Diamond" by the company.
In 2016, Canada produced the largest native gem-quality diamond rough – this 187.63-carat diamond was excavated in the Diavik mine in northern Canada in the spring of 2015. It was named “Fox Fire†due to its unusual fluorescence and phosphorescence under ultraviolet light. (Foxfire)".
It exhibits brilliant strong blue fluorescence under the illumination of long-wave ultraviolet light (313 nm and 365 nm), and then appears in the dark room for a long period of warm orange phosphorescence.
Don't think that its discoloration is over, and it's even more amazing: under indoor lighting, the "Foxfire" diamond is light yellow, but after long-wave UV radiation, it returns a light brown color when returned to indoor lighting. Fortunately, this change lasted for a few minutes in outdoor lighting.
Chameleon Diamond - Principle of Color Change
The appearance of "Chameleon Diamond" breaks the color of the diamond and its quality is a permanent assertion. Since then, many diamond experts have begun to pay attention to the wonderful phenomenon that diamonds can change color. Expert research has found that heat and light cause discoloration of the diamond.
Thermochromism means that the temperature of the chameleon diamond increases from 150 ° C to 250 ° C, the color will be deepened or changed, and then as the diamond temperature cools, the color of the diamond will return to its original color before heating.
Photochromism means that the color of the diamond will become darker/lighter after the chameleon diamond has been stored for a period of time. When the diamond is placed again in a bright place, the color will slowly recover.
Chameleon Diamond - Identification
Chameleon diamonds can be judged based on whether the color changes after heating. But not all gray-green or brown-green diamonds have a chameleon effect.
Experts pointed out that the hydrogen (H) content is high or does not contain hydrogen (H) yellow to gray brown green diamond, plastic deformation of the grayish green or brown green diamond does not have a chameleon effect; no phosphorescent yellow to brownish green, containing H Diamonds, although similar in spectral characteristics to chameleon diamonds, do not have a chameleon effect. In addition, since the irradiated green diamond is heated, the color will undergo permanent irreversible changes.
So if you want to know whether a green diamond is really a chameleon diamond or a irradiated diamond, it is best to choose a well-equipped laboratory for identification. In some certificates, the discoloration effect of a diamond is an important feature that is described separately.
With advanced spectroscopy techniques, the fluorescent and phosphorescent characteristics of chameleon diamonds can be distinguished from other types of natural green diamonds or irradiated green diamonds.
NINGBO LUCKY CHEMICAL INDUSTRY CO., LTD , https://www.nblkchem.com