The identification of jewelry and jade depends on the mineral composition, not the origin. (For example, Hetian jade, the national standard stipulates that if it contains most tremolite components, it can become Hetian jade. Therefore, Qinghai materials and Russian materials also meet the standards and can also become Hetian jade)
For example, diamonds are all made of carbon (C), and there are many countries that produce diamonds all over the world, and all of them are of good quality and poor quality, so it is meaningless to divide the origin. Therefore, the quality of diamonds is only divided according to the quality grade (as are other white jade stones).
The criteria for becoming jewelry and jade are rarity, durability, aesthetics and machinability. Usually, a gem resource exists in many countries. Under the same quality, after processing into ornaments, it is basically impossible to tell the origin.
This thing is like oil, which is produced in many countries. Will you go to the gas station and ask if your oil is Iranian or Saudi?
In a jewelry store, except for jewelry with only one origin (few), the clerk tells you where this gem comes from, which is a lie. In order to be tactful, he sells the goods. In fact, if you ask them what evidence you have, they will be poor.
In addition, you can also refer to the national jewelry appraisal standard GB/T 16553.
Ask if you don't understand! (I am engaged in jewelry quality inspection ~ ~)