Irradiation

Irradiation: The process of exposing certain diamond or other pale or poorly colored gemstone to radiation, such as in nuclear reactor, X-rays, neutrons from an atomic pile, deuterons a nucleus of the heavy hydrogen atom, gamma rays from a cobalt-60, electrons positive or negative from a linear accelerator or a cyclotron, protons a particle in the core of all atoms from cyclotron. With the effect of artificially altering the color by artificially creating color centers due to crystal defect in the space lattice. Green irradiated diamond often changes to color to yellow or cinnamon brown for some hours by heat-treatment.

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Definition of Irradiation
http://m.alexandrite.net/viewpage.html?id=GG-094-00007

The process of exposing certain diamond or other pale or poorly colored gemstone to radiation, such as in nuclear reactor, X-rays, neutrons from an atomic pile, deuterons a nucleus of the heavy hydrogen atom, gamma rays from a cobalt-60, electrons positive or negative from a linear accelerator or a cyclotron, protons a particle in the core of all atoms from cyclotron. With the effect of artificially altering the color by artificially creating color centers due to crystal defect in the space lattice. Green irradiated diamond often changes to color to yellow or cinnamon brown for some hours by heat-treatment.

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Alexandrite Gemstone Encyclopedia & Jewelry Collector Guide
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Irradiation