The natural inclusion visible in amber detection refers to the natural inclusion observed when amber is examined under magnification. These inclusions can be bubbles, streamline, insect or animal and plant fragments and other organic and inorganic inclusions. These natural inclusions are wrapped by natural substances in the process of amber formation, such as air, sand, stones and so on.

It should be noted that some merchants may mislead consumers with the expression "with natural inclusions", and should describe them according to the specific types of inclusions, such as "with natural gas bubbles" or "with natural streamline".