Gem identification and detective reasoning are the same, well-founded. Come up and say it's true, not tell you why, or you'll know it's false at first glance. In Zhihu dialect, it is a rogue. The evidence obtained by photo identification is limited to color, transparency, processing marks (individuals), structural features (individuals) and cleavage fractures (individuals), so other gems can not be accurately judged except these gems with typical characteristics. For example, the pickling and coloring products of jadeite (B+C goods) are characterized by high transparency and bright colors, but the same is true of natural high-end jadeite (A goods), but the difference between them is that the color of BC goods will be distributed along structural cracks like silk pulp. Therefore, if the color distribution is not reflected in the photo, it is impossible to accurately judge whether it is BC goods or A goods.