Diamond fluorescence should be observed under the irradiation of ultraviolet light. Whether diamonds have fluorescence or not is difficult to distinguish under natural light, and the visible light emitted by diamonds can only be seen under strong ultraviolet light. This visible light is mostly blue, and a small number of diamonds may emit green or orange fluorescence. Internationally, diamond fluorescence is classified into five levels: no, weak, medium, strong, and very strong. Diamonds without fluorescence have the best quality.
Diamond fluorescence level
According to international standards, diamond fluorescence is divided into 5 levels, and the diamond fluorescence level classification table from high to low is: None, Faint, Medium, Strong, Very Strong.
No fluorescence: Diamonds do not react under ultraviolet radiation.
Faint weak fluorescence: Diamonds can see weak fluorescence under ultraviolet radiation, but cannot distinguish color.
Medium fluorescence, Strong strong fluorescence, Very Strong very strong fluorescence: Under ultraviolet irradiation, diamonds have obvious visible fluorescence and colors can be distinguished (such as blue fluorescence, yellow fluorescence, etc.).