1. Emerald is green, but it is an iron dragon. Tielongsheng, a kind of jadeite in Gan Qing, is a mid-range jadeite with bright green color, poor opacity, loose structure and columnar crystals arranged in a certain direction, which can often be seen in the market.

2. Dark green jade is one of the proper nouns of green grade, that is, it is a kind of green jade. The color is translucent or opaque, with strong color, bluish black without losing the green tone. If the texture is pure and smooth, it is a good product in jade.

3. Oil-green species is a kind of dark green jadeite with gray-blue color, but it is well planted and of good quality. It has good light transmittance, but it is not very popular because of its dark color. Glutinous rice seed is second only to ice seed, and it is also the top grade of jadeite. Its color is like glutinous rice, and its transparency is not as good as that of ice seeds.