1 level and junior level 5 jewelers have a preliminary understanding of the basic knowledge of jewelry, and can roughly distinguish common gems through the naked eye and basic knowledge.
2. The jeweler at the level of intermediate level 4 has completely mastered the identification of almost all gems through scientific instruments, and comprehensively mastered the comprehensive physical and chemical knowledge of all kinds of jewelry.
3. On the basis of the above, senior three people have a more complete grasp of the value evaluation ability of all kinds of jewelry.
4. Grade II 1, that is, technicians and senior technicians.