The following is the irradiation method for the artificial optimization of diamonds introduced by Xiaobian for friends. In the method of identification of irradiated diamonds introduced yesterday, a certain amount of irradiation knowledge has been introduced. What is the optimization of diamond irradiation?
Irradiation can change the color of a diamond, and this is the only diamond treatment that exists in both natural and laboratory conditions.
In 1904, William Crookes first used laboratory conditions as a way to change the color of diamonds. At the time, he succeeded in turning the diamond into dark green. However, such diamonds become very strong and therefore cannot be worn. Current radiation methods are safe and can produce green, blue or black colored diamonds. But by increasing the activity of the diamond's carbon atoms, an annealing process, the irradiated diamond can turn yellow, orange, brown or pink. These four methods of changing the color of diamonds by radiation are currently used.
Cyclotron method: bombards the protons and nucleus of a diamond through a cyclotron. The cyclotron treated diamonds will appear cyan or green on the surface and annealed to 800 ° C to make them yellow or orange. This method has become less and less common.
Neutron impact: This method uses a nuclear reactor to turn the entire gem into green or black, which emits intense white light. Diamonds treated with neutron impact must be annealed to 500-900 °C.
Gamma Ray: This is the cheapest and safest method of diamond radiation. But this method takes several months. Gamma rays strike the diamond by exposure to cobalt 60 rays to produce a blue to blue-green color that penetrates into the entire gemstone. Blue diamonds produced by radiation are not power semiconductors like their natural partners.
Electron Impact: Vande Graaff uses electrons to strike diamonds to turn colors into green, blue-green or blue. However, the color of the radiated diamond produced in this way will only exhibit a depth of 1 mm. Electron impact diamonds must be annealed to 500-1200 °C. Annealing turns the neutron and electron impact diamond into yellow, orange, brown or pink.
Irradiated diamonds display a beautiful line in the red area of ​​their absorption spectrum before the annealing process, which is one of the main indicators of this treatment. Annealing usually erases this line, but new lines are created.
Radiation treatment of diamonds uses high-energy radiation to illuminate the diamond to change its color. Although the artificially colored diamond is not much different in appearance from the natural colored diamond, its color is not formed by the color center of the impurity-containing ions, but by the artificially produced lattice defects. Its coloration is fundamentally different from natural colored diamonds.
Natural green diamonds are formed after years of exposure to natural radiation. However, exposure to a-ray will only cause a green hue on the surface, while beta or gamma radiation can penetrate deeper into the interior of the diamond, giving the gem a more comprehensive color.
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