2. Refractive index, the ratio of light propagation speed in vacuum to light propagation speed in medium. The higher the refractive index of a material, the stronger its ability to refract incident light. The refractive index of jadeite (including jadeite jade bracelet) is about 66 (point measurement method).
3. The refractive index of jadeite is 66, which means jadeite is genuine. Refractive index is an important factor to identify the quality of jadeite. The refractive index of jadeite is the ratio of the propagation speed of light in air to that in jadeite.
4. The refractive index written on the jade certificate refers to a basic parameter of the optical medium. Usually, the refractive index of natural jade is 65 ~ 67. If it is lower than this value, it means it is not natural jade. Under the irradiation of light, the light refracted by natural jadeite is clear and bright, while the fake jadeite is blurred.
5. The refractive index of natural jadeite is 66, which means that this is the unique optical property of natural jadeite and the key evidence for jadeite identification according to spot measurement.
6. Jade, whether it is a bracelet, pendant or bead string, as long as it is made of jade, its refractive index is 66, which is the physical characteristic of jade.