In this grading standard, “work” refers to the shape, workmanship, and weight of a jadeite product. It should be pointed out that due to differences in the designer, craftsmanship, cultural connotation, production age, and volume of jadeite products. Each piece has its own characteristics, and detailed grading is impossible. Some websites are like this:

Level shape work weight

Level 1 is suitable, full of generous masters, and more than 5 carats

Level 2 is suitable, full and generous, natural and smooth, unique and more than 5 carats

The 3rd grade is suitable, full and generous, and it is smooth and smooth.

Level 4 is suitable for production and generally requires no

Protective Face Mask

filter efficiency ≥95%

 prevention of virus

 resistance to germs

wear for 36 hours

Protective Face Mask (Non-medical)

KN95 mask

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