1. Composition and calculation method of gold Gold is a yellow precious metal with high density, softness, corrosion resistance (chemical symbol is Au) and the highest ductility among known metals. The purity of gold is calculated by K, and it is divided into 24 grades according to the gold content ratio (i.e. 1K~24K), so in terms of purity, 1K is equal to 4. 1666% gold content. Generally speaking, jewelry materials used all over the world are not less than 8K, which means that the commonly used K gold composition is 17 (that is, 8K~24K gold). In addition, the definition of 24K gold has been controversial all over the world, because it is impossible to have 100% pure gold in nature, so different countries may have different standards for the definition of "pure gold", so please pay attention to the relevant labels when buying precious metals.
Because the hardness of pure gold is similar to that of nails, gold jewelry is more easily deformed than other precious metal jewelry. Metalworking masters need to combine pure gold with other metals to form alloys to increase its hardness, thus making more jewelry changes. Generally speaking, silver, copper, zinc and other metals are added to gold to increase its strength and toughness, thus making high-grade jewelry inlays or large jewelry. The metal produced in this way is "K gold", and the common ones are 18K gold (with a gold content of 75.0%) and 65438+.
. Generally speaking, Asians prefer high-purity gold such as 22K and 18K, while Europeans and Americans prefer 14K or 10K gold jewelry. However, in recent years, Asians have gradually begun to accept 14K gold jewelry. At present, according to the total amount of K gold produced by precious metal foundries, the proportion of users of 14K gold has reached 65438. Although the lower the purity, the lower the price. And 14K gold is more suitable for making complex jewelry because of its increased hardness, which is more durable and has the benefit of preserving value.
2. Interesting relationship between K-gold and color When K-gold reaches the content standard, in order to enrich the change of K-gold, K-gold with rich colors can be synthesized by adjusting the proportion of other alloys, which is where K-gold is popular. The famous Japanese jewelry magazine Gem Four Seasons mentioned that there are 450 kinds of K gold, but only about 20 kinds are most commonly used. Today, I will introduce three mainstream K-gold formulas: yellow, red and white.
Gold: It is a yellow precious metal alloy made of gold, silver and brass. Use the different specific gravity of silver and brass to adjust the depth of yellow; Red gold: it is a pink precious metal alloy, made of gold, silver and copper, and copper is the main reason for the redness of gold. Red gold is also called rose gold. Rose gold is bright in color, harder and more malleable than pure gold. It is used in jewelry manufacturing, also known as rose gold, red gold and purple gold. Because it was widely used in Russia at the beginning of the19th century, it was also called Russian gold or Russian Zijin. Platinum: It is a white precious metal alloy made of gold with palladium and silver. Because white gold is white, it is most easily confused with platinum (platinum), but it is a completely different metal from platinum. And because the main raw material of platinum is gold, you should know that "the color of platinum will still be yellow", which platinum and silver can never compare. The reason why the platinum jewelry sold in the workshop is white is actually the reason for re-electroplating. If the platinum jewelry you bought feels yellow in some areas after several years, this is a normal phenomenon, which is the reason why the electroplated layer is thinned and the real platinum is exposed. Please also pay special attention before buying. How's it going? I believe that through the above knowledge, you have a better understanding of gold. I also hope that you can use these contents when you buy gold in the future.