① see color. To see whether pure color, rich and gaudy, uniform and used condenser flashlight check whether there are hidden sterigmatocystin. A rich and gaudy colors, and pure, uniform, tiny impurities are better. In emerald green jade has higher prices, followed by red, purple. They turned around and fresh green, yellow tone for the seedlings slightly Green is the best, followed by the Green Gem, the river green, glossy dark green, are distributed evenly to the Green good.
② observe transparency. Under a bright light observation, the higher the better transparency.
③ hearing voices. Pleasant, sharp percussion sound better.
④ observation Chui and stone flower. Optical observation, the Feitsui other mineral particles in the flashlight (that is, of Greenfield), and often massive Effects of Mission, said Stone spent. Less is better to both.
⑤ see cracks and Peutz. Some of the cracks in the ore, but also some of the processing to less for the good of Peutz throughout the Feitsui is the black spot, but also to small and less is better.
⑥ look at the processing level. The surface smoothing, polishing good shape is better.