OL Jewelry Network is the first company in China that focuses on office women's jewelry, diamonds, diamond rings, wedding rings and diamond rings. Half cheaper than traditional jewelry stores, Italian designers customize personalized jewelry for you, which is worth the money and luxury is no longer expensive. Fire color is an important embodiment of the beauty of diamonds, but good fire color can only be achieved through accurate processing. From the physical point of view, diamond fire color is composed of external fire color, internal fire color, scattered light fire color and luminous fire color (Verena Pagel-Theisen, 1993): 1. External luster, that is, luster, is caused by the reflection of light on the surface of jewelry. The main factor affecting the luster is reflectivity. The higher the reflectivity, the stronger the luster. However, there is a positive correlation between reflectivity and refractive index (such as second order): that is to say, diamonds have strong luster because of their high refractive index. R0 = (n-1) 2/(n1) 2×100% R0 is the reflectivity and n is the refractive index. However, besides the refractive index, the luster of diamond also depends on the surface quality, flatness and polishing degree. The smoother the diamond surface, the higher the polishing degree and the stronger the luster. In order to improve the fire color of diamonds, it is necessary to cut and polish the facets of diamonds. Second, the inner glory. The inner brilliance is caused by the refracted light of the diamond during the journey. If the light incident inside the diamond is totally reflected by the facets in the pavilion and reflected from the crown (Figure 8- 1), the diamond will appear dazzling and bright. If all or part of the light incident on the diamond comes from the diamond pavilion, the diamond will look dull and unattractive. In order to fully display the internal fire color, the diamond must be carefully preset, and the number of faces and the original angle between faces must obey the optical characteristics of the diamond. These are key considerations for diamond cutting and grinding. 3. Dispersive luster We know that natural light is composed of single-band light with different wavelengths, including red light (780-640nm), orange light (640-595nm), yellow light (595-570nm), green light (570-500nm) and green light. When natural light is separated due to inevitable optical reasons, it will form a chromatography with lace, that is, natural light chromatography. Natural light incident on a diamond will be scattered because of the different refractive indexes of various kinds of light with a single color in the natural light in the diamond. After careful preset diamond cutting, the scattered light can be repeatedly reflected and further dispersed, and then emitted from the crown, so that we can see all kinds of monochromatic light of the diamond from the crown of the diamond, that is, fire. The better the diamond processing technology, the more natural light is dispersed, the more fire color is enough, the more beautiful the diamond is, and the higher its value is. 4. Sparkling brilliance is a phenomenon that the color, brilliance and luminosity of jewelry change when the jewelry rotates or changes the light source (Verena Pagel-Theisen, 1993). The amount of light reflected when stepping into a diamond depends on the number, size, geometric symmetry and polishing quality of facets. In order to make the color, luster and luminescence of the diamond change when rotating or changing the light source, so that the diamond is full of vitality, it needs to be carefully preset and processed according to the optical characteristics of the diamond.