Pale yellow should be Donghai yellow, also known as additive yellow, and it is also crystal stone. The color of the crystal changed after heat treatment. Smoke crystal (tea crystal), amethyst and topaz are interchangeable at different temperatures. In other words, smoke crystals can become topaz at a certain temperature, topaz can become amethyst at a certain temperature and so on. . . Look at some amethysts, which are formed by uneven temperature during color exchange. In this way, the colors of topaz after artificial heat treatment are light yellow and lemon yellow. The color of natural topaz is orange, which is mainly produced in Brazil, so we generally call it Brazilian yellow. In terms of price, of course, the price of natural color is high. But it also depends on some factors, such as color, purity, crystal size, carver and so on. So even Donghai Huang, the certificate says crystal. Donghai yellow is very cheap, and tens of dollars can buy what the landlord said is transparent, without cotton and cracks. Hope to adopt