"AU" is a symbol used internationally to indicate the purity of gold (ie, gold content). K gold (or gold) is an alloy of gold and other metals. K gold jewelry is characterized by low gold content, low cost, and can be made into various colors, and is not easily deformed and worn. Gold is divided into 24K gold, K22K gold, 18K gold, gold, etc. according to the amount of gold. 9K China's most popular "18K gold", its gold content is 18 × 4.1666 = 75%, the mark on the jewelry should be marked as "18K" or "750". What is K gold? K Jin's "K" is the preparation of the term "Karat". The complete notation is this: Karatgold (K gold), K gold is measured by: pure gold is 24K (ie 100% gold), 1K The gold content is about 4.166%. The method of calculating the gold content with "K" is based on a carob tree on the Mediterranean coast. The carob tree has a light red flower, and the pods are about 15 cm long. The beans are brown and can be made into glue. No matter where the tree grows, the size of the beans is exactly the same, so in ancient times, people used it as a standard for measuring weight. Over time, it becomes a unit of weight for precious, subtle items. At that time, the measurement of diamonds and gold also used this unit, that is, "Karat" until 1914, when the international standard "Karat" was set as the current standard. K gold information introduction Everyone understands the meaning and calculation method of K gold, so it is not difficult to know how many kinds of K gold, according to international standards, K gold is divided into 24 kinds, that is, IK to 24K. However, as the type of K gold used for jewelry, this is not the case. At present, the jewelry materials used in countries around the world are not less than 8K. In this way, there are actually 17 types of K gold that are actually counted as jewelry. Among the 17 K gold materials, 14K is the most used, and 18K is the main jewellery material in the jewelry industry. The main features of K gold jewelry In order to enrich the expressive power of various K gold, foreign countries adjust the ratio of other alloys to the same ratio, and synthesize K gold with different colors. According to Japan's famous jewelry magazine "Gemstone Four Seasons", there are now 450 kinds of gold, the most commonly used are 20 kinds, for example, there are 6 kinds in 14K: red, red yellow, deep yellow, light yellow, dark yellow, Greenish yellow; there are 5 kinds in 18K: red, reddish, yellow, light yellow, dark yellow. Five ways to identify platinum or K gold or silver One of the characteristics of gold is its softness, so it is difficult to inlay a variety of exquisite styles, especially when it is inlaid with pearls, precious stones and jadeites. Therefore, people add a small amount of silver, copper, zinc and other metals to the gold to increase the strength and toughness of gold. The gold ornaments made in this way are also called K gold. K gold can be made into various colors according to needs. There are various colors of K gold jewelry popular in the world. Everyone has yellow and white. When gold is mixed with 25% palladium or nickel, it will become white, and the main component that makes up it is gold. This is called white gold. At the current state of the art, it is not possible to extract pure gold materials with a purity of 100%. Therefore, the gold standard K indicating the pure gold content in gold products is generally referred to as pure gold as 24K gold, but it is theoretically only 100% gold, which does not exist. Therefore, in the national standard, the gold content of the merchant's gold jewelry should not use the "24K gold" non-standard standard method. Since the pure gold is 24K, that is, the theoretical gold content is 100%, 1K means that the gold product contains 1/24 of the pure gold, which is about 4.16%. 18K gold represents 18/24 gold, which is 75% pure gold, and the rest are other materials such as silver or copper. As the saying goes, "Gold is not full of red, no one is perfect", and other gold ornaments contain other metals. For the quality of gold products, the national standard has a very clear regulation, that is, each piece of gold jewelry sold by the merchant must be listed to indicate its gold content and weight. The weight of gold jewelry is always subject to the national legal unit of measurement. The gold content should use “K gold†(excluding 24K gold), “foot gold†(with gold content not less than 99%), “thousands of gold†(including gold content not less than 99.9%), and “1000 foot pure gold†or “ Pure gold" and the standard method of "24K gold" which does not exist in practice. The reason why K gold jewelry is popular Comparison method: Platinum is grayish white to the naked eye, with a hard texture and a hardness of 4.3. Silver is visible to the naked eye, the color is clean white, the texture is more delicate and smooth, the hardness is lower than that of platinum, and the hardness is 2.7. Identify the seal: Since each piece of jewelry must be engraved with a seal of composition, so if you see Pt, or see Platinum, Plat, it is platinum; if you see S, or see Silver, it is silver. In addition, note the copper silver plated symbol, which is SF. weigh: This method can be used if the seal is blurred or the seal has been truncated. The density of platinum is high, the specific gravity is 21.4 kg/dm3, and the specific gravity of silver is 10.49 kg/dm3. In this way, the same volume of silver weighs only half of platinum, and the two are easier to distinguish. Cremation discrimination: Sometimes when you encounter less material, the weight on your hand is not obvious, and there is no seal, then you have to use this method. Platinum is heated or fired. After cooling, the color is constant; while silver is heated or fired, after cooling, the color is red or black. Chemical method: Platinum is ground on the touchstone, and then a few drops of the droplet are mixed with nitric acid and hydrochloric acid. If the wear scar is present, it means platinum. As for the color, there is some difference in color; if the droplet is on silver, grind The marks will be lost. K gold jewelry classification standard K-gold jewellery is very popular in Europe, especially in the world of Italian K-gold jewellery. Currently, the popular K-GOLD on the market is the K-gold jewellery of Italian craftsmanship with a content of 14-18K. K gold is highly malleable and can be used to make a wide variety of colorful gold jewelry. Therefore, the price of K gold is not calculated based on the price of gold. Because of its craftsmanship, the main value lies in the craft, so The price of K gold is very related to the craft. The process gold of gold is very high. Sometimes the price of one gram is about 900 yuan, far exceeding any precious metal. When you buy K-gold jewelry for the popular reason, please check the metal mark on the jewelry, some are not precious metals, such as: 18GKP alloy. Seven ways to maintain 18K gold jewelry ——The gold content of each K gold is (the national standard in brackets) 8k=8*4.166%=33.328%(333‰) 9k=9*4.166%=37.494%(375‰) 10k=10*4.166%=41.660%(417‰) 12k=12*4.166%=49.992%(500‰) 14k=14*4.166%=58.324%(583‰) 18k=18*4.166%=74.998%(750‰) 20k=20*4.166%=83.320%(833‰) 21k=21*4.166%=87.486%(875‰) 22k=22*4.166%=91.652%(916‰) 24k=24*4.166%=99.984%(999‰) Note: 24k gold is often considered to be pure gold, which is "1000‰", but the actual gold content is 99.99%, which is 23.988k. 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