Glue injection is a common treatment method for low-end jewelry. Why do you want to inject glue? To put it bluntly, it is to repair cracks and facilitate processing, such as crystals and jadeite. They don't inject glue until they crack, so injecting glue is the low end. Amber beeswax is injected with glue for the same reason. What should I do if a rough stone is polished and the surface bubbles are broken? Re-grinding has caused serious losses and even scrapping. So it's good to fill a glue, which not only keeps the original state, but also avoids big losses. Amber glue injection has a proper term called "filling amber", which belongs to the category of "treatment". Small glue injection can be identified with the naked eye, and it is difficult to find it without looking carefully.