The answer above is wrong. Synthetic crystal is not glass, it has crystal nuclei inside! So it has a certain effect, but it is definitely not as good as natural crystal! Synthetic crystal (smelted crystal): also known as artificial crystal, it is made by refining the raw material quartz sand through a series of processes, adding metal elements (such as lead) to enhance the refraction of light, and then using fine cutting technology and flawless polishing techniques. The crystal is pure and transparent, making up for the shortcomings of natural crystal. Due to the complicated process of artificial crystal, some prices are even more expensive than natural crystal. The production of synthetic crystals, including colorless synthetic crystals mainly used in industry and colored synthetic crystals mainly used in the jewelry industry, are all synthesized by hydrothermal methods. Their main components, optical properties, and physical properties are the same as those of the corresponding natural varieties, but they are purer and more suitable for industrial or jewelry industry requirements. Synthetic colored crystals must add some colorants or doped ions to form color centers, present beautiful colors, or be changed to another color by irradiation or heat treatment. For example, the rose or light green brown color is made with titanium, the light brown color is made with vanadium, the green color is made with chromium, the brown or dark green color is made with manganese, the purple or bright yellow-green, yellowish brown or yellow color is made with iron, and the brick brown color is made with iron. Or light blue and blue are added with cobalt, light green and cyan are added with nickel, light yellow are added with copper, and dark brown are added with aluminum. Amethyst is the most noble and beautiful member of the crystal family, also known as Feng Shui stone. The Japanese call Amethyst an energy stone. Amethyst is purple in color because trace amounts of iron are incorporated into it, and iron oxide is the main reason for its bright purple color. Amethyst can also form other styles, most of which are inward-looking geodes (purple geodes), while outward-growing Amethyst clusters (the most common white crystal clusters on the market) are extremely rare.