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Au750 refers to an alloy containing 75% gold and 25% other metals, commonly known as 18K gold. Usually used to make jewelry, the mark is G18K, G750 or Au750 “where G is the meaning of gold content”. 24k gold is often considered pure gold, but the actual gold content is 99.98%. The purity of gold and its products is called “color”. There are two types of color markings on the market for gold products: one is percentage, such as G999, and the other is K gold, such as G24K, G22K, and G18K. my country has regulations on the marking and identification of gold products, and generally requires the production company code, material name, content imprint, etc., and no imprint is an unqualified product. The same is true internationally. But for some very fine products, it is allowed not to mark. National standard GB11887-89 stipulates that the gold content per opening (abbreviation of carat in English and karat in German, writing K) is 4.166%. Au750 not only has the precious value of gold, but also has the advantages of strong ductility, high hardness, and variable colors. It is very popular. Because the price of gold fluctuates daily, the price of au750 also fluctuates. The current price of gold is 346 yuan a Gram, au750 price is about 75% of the price of pure gold. The price of gold varies from day to day. Depending on the process and the other 25% gold-containing species, the price of diamonds is also different, and the price of Au750 fluctuates accordingly. 24k gold means 99.99% pure gold, Note: 1. K: refers to the purity of gold. Purity: refers to the vividness of colors. From a scientific point of view, the vividness of a color depends on the single degree of light emitted by this hue. The colors that can be distinguished by the human eye with the characteristics of monochromatic light have a certain degree of vividness. Different hues not only have different brightness, but also different purity. For example, red in the pigment is the hue with the highest purity, colors such as orange, yellow, and purple are also higher in the pigment, and blue-green is the hue with the lowest purity in the pigment. In the daily visual range, most of the colors seen by the eyes are gray colors, that is, unsaturated colors. With the change in purity, it is so rich in the world. Even if the purity of the same hue changes slightly, it will also bring changes in color personality. Each open (abbreviation of carat in English and karat in German, often written as “k”) has a gold content of 4.166%, 18k=18*4.166%=74.998%, 24k=24*4.166%=99.984% 24K contains 99% gold, 22K contains 91.7%, 18K contains 75.1%, 14K contains 58.5%, and 12K contains 50%.
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