Among the many indicators for assessing the quality of jadeite, color (color), texture (species), transparency (water), land (bottom), craft level (work) and weight, etc., the most visible but intangible "Bottom". "Bottom" is the characteristic of the light green base part except green, which is a comprehensive expression of jade texture (species), transparency (water), luster, clarity and light tone. "Bottom" is more of an aesthetic indicator, so the evaluation of the "bottom" is not quantifiable. The background color is other colors than jade. When jade is colorless, the "bottom" is species, water, The comprehensive expression of luster and clarity, and when the jade is full of green or full color (orange, yellow, black, etc.), the color is integrated with the base. At this time, the "bottom" is the species, water, color, luster and net. The comprehensive manifestation of degree. It can be seen that the “bottom†of jade contains two key elements and three general factors. The two key elements are texture (species) and transparency (water). The three general factors are gloss, base color and jade. The degree of clarity. Therefore, the evaluation of the merits of a jadeite finished product or semi-finished product "bottom" mainly depends on the effect of the combination of jade and species and water. The "bottom" of jadeite is solid, compact, high-transparency, lustrous, main color (green) and base, coordinating with the whole ornament and the beginning. The "bottom" clean and delicate jade jade is processed. The surface is very smooth and transparent under the illumination of light, which can fully reflect the charm and aura of jadeite jade pieces. The business people in the jade world call this phenomenon "poetry foot". It is related to the processing quality and ornamental effect of jade jade, which affects the quality grade and commercial value of jade jade pieces. Many people confuse the concept of "species" and "bottom" when purchasing jade. In fact, there are essential differences between the two: the focus is on the microscopic indicators of the internal structure of jadeite, and the bottom is the external and macroscopic overall feeling. In general, the difference is the bottom, but the bottom is not necessarily good. Therefore, when selecting the jadeite product, the player must not only look at the seed, but also look at the bottom, look at the pros and cons of the color, and see if the jade is clean and dirty, and see if there is any grain or crack.
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