Diamonds are excited by long-wave ultraviolet light to emit fluorescence@sallor.com

Some minerals or gems are exposed to external energy such as X-rays, ultraviolet light, and other high-energy rays to emit visible light. When the external energy stops firing, the luminescence phenomenon stops. This phenomenon is called fluorescence effect.
     Fluorescent colors are yellow, Van Cleef & Arpels Vintage Alhambra 10 Motifs yellow-green, orange-red, pink, blue and white, and so on. In gemology, there are two kinds of ultraviolet light used for fluorescence detection, one is the long-wave ultraviolet light with wavelength of 365NM, and the other is short-wave ultraviolet light with wavelength of 254NM. The fluorescence intensity of diamond grading is determined by the fluorescence intensity and color tone of long-wave ultraviolet light. Under long-wave ultraviolet light, if the fluorescence intensity and fluorescence intensity of the diamond to be classified are the same as those of the sample, The fluorescence intensity level of the sample is the fluorescence intensity level of the replica Van Cleef & Arpels Sweet Alhambra earstuds diamond to be classified.

     According to China's national standard, fluorescence intensity is divided into four grades: strong, medium, weak, no The intensity of the fluorescence and the color of the fluorescence are recorded in the corresponding section or memo of the diamond grading report. CIBJO diamond grading standards are set with three strong, medium and weak fluorescence intensity of the standard sample, the fluorescence is divided into strong, medium and weak, no four grades; vancleef alhambra bracelet copy GIA is the fluorescence intensity is divided into strong, strong, Weak and no five grades.