Diamonds have very high refractive index and strong dispersion, which is also the reason why diamonds reflect colorful flashes. Diamonds emit blue-green fluorescence under X-ray irradiation. Primary diamond ore only occurs in kimberlite cone or a small amount of K-Mg lamprophyre.
The color of diamond depends on the purity, the type and content of impurity elements. Ultra-pure diamonds are colorless and usually have different degrees of yellow, brown, gray, green, blue, ivory and purple. Pure people are transparent, translucent or opaque, with impurities;
Under cathode ray, X ray and ultraviolet ray, it will emit different colors of fluorescence such as green, sky blue, purple and yellow-green. Light blue phosphorescence is emitted in the darkroom after the sunlight is irradiated; Diamond luster, a little greasy or metallic luster, high refractive index, generally 2.40-2.48.
Extended data:
The use of diamonds
1, diamond for industrial, geological and petroleum drilling, diamond for wire drawing die, diamond for abrasive, diamond for dresser, diamond for glass cutting machine, diamond for hardness tester head and diamond for handicrafts.
2, chronic poison, during the Renaissance, Italian giants were popular with chronic poison made of diamond powder. People who eat diamond powder will stick to the stomach wall. In the long-term friction, people will get gastric ulcer, if not treated in time, they will die of gastric bleeding.
3. Decorate gems. Because of its high refractive index, diamonds shine in the light and become ladies' favorite gems. Huge beautiful diamonds may be priceless. Diamonds with dark colors are more expensive. At present, the most expensive colored diamond is aquamarine diamond with a slight blue color.
References:
Baidu encyclopedia-diamond