Natural green crystal glass is real. Yellow is the so-called bamboo leaf green, and the dark ones are all synthetic goods. The bamboo leaves in the crystal are very light in color. Under normal circumstances, you can hardly see the color, but you can see the yellow when you look at the lens vertically. The reason is that the yellow color of natural topaz itself is not deep, and the yellow color can not be seen basically because of the thickness after cutting into lenses. In the past, this kind of goods was because the natural brown crystal lenses had different shades of brown, but they did not fade clean after heating, leaving a little yellow. In modern Zhejiang, young anchors make a fuss about new names. Nowadays, the market is rising, and the topaz original stone is rising rapidly because of the high price of bamboo leaf, so the natural bamboo leaf is expensive, light in color and thick in lens, but it can only be seen if it is ground into a frameless frame. The eye-pleasing effect of black bamboo leaves is no different from that of ordinary crystal glass. "Tian" is a Chinese character, meaning endowed by nature, from Historical Records Biography of Hou Fu. Explain what nature gives; Born; Naturally occurring; Naturally formed. Growing in the natural environment, without processing or with a small amount of processing, can be understood as natural.