The refractive index is 1.62, and the density is 2.95, indicating the fiber interwoven structure. The identification density of nephrite is 2.95g per cubic centimeter, its optical characteristics are heterogeneous aggregates, its refractive index is 1.62 (spot measurement), its absorption spectrum is featureless, and it is a fiber interwoven structure after amplification. Identification of a kind of jewelry and jade requires at least three kinds of inspection evidence. Refractive index is the physical constant of a substance, and the refractive index of the same substance is relatively fixed. From these points combined with naked eye observation, it can be identified as Hetian jade.