The bottom refers to the extent of jade flocs (also known as cotton ), dark spots, and other stains. Because jadeite is a collection of various minerals, its structure is mostly fibrous structure and granular structure, and the degree of impurities will inevitably affect the value of jadeite.
Level division standard
1 grade 10 times magnifying glass does not see any splitting, grayish black silk, occasionally individual white cotton, small black spots in the inconspicuous place
2 grade 10 times magnifying glass, no cracks, see a small amount of fine white cotton, black spots, gray black silk
Grade 3 has no cleft palate, a small amount of cleft palate under a magnifying glass of 10 times, a small amount of white cotton, black spots and a small amount of ice residue visible to the naked eye.
4th grade, see a small amount of cleft palate and more white cotton, black spots, gray silk and ice residue
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