The difference between 999 sterling silver, 990 sterling silver and 925 sterling silver

The real 999 sterling silver is a piece of metal. Its silver [Ag] content is 99.9%. Mohs hardness: 2.5. 990 pure silver contains 99.0% silver and is used to make silver ingots, silver ingots, silver bars, and silver coins. 925 sterling silver is 92.5% silver for jewelry processing. Silver is a kind of active 　　 The real 999 pure silver is a piece of metal. Its silver [Ag] content is 99.9%. Mohs hardness: 2.5.　　　　 990 sterling silver is 99.0% silver used to make silver ingots, silver ingots, silver bars, and silver coins.　　　　925 sterling silver is 92.5% silver for jewelry processing.　　　　Silver is an active metal. 99% of high-purity silver easily reacts with sulfur in the air to make the silverware black. Therefore, the silver jewelry used to be worn for a period of time will become black and unsightly. Due to the characteristics of silver itself, 100% silver is very soft and easily scratched, and is not suitable for fine craftsmanship requirements, as well as the increasingly rich and exaggerated modeling requirements of modern popular jewelry, plus 100% silver is easy to change color Therefore, after Tiffany launched the first set of silverware containing 92.5% of silver in 1851, 925 silver quickly became the main force of silver jewellery and became the international identification of whether silver jewellery is sterling silver. Standards. Since then, 925 sterling silver has become the '925 International Standard Silver'. 925 silver is added with 7.5% alloy, usually copper, so that the silver has ideal hardness, brightness and luster, and oxidation resistance. And it can be inlaid with various gems. Since then, silver jewelry has bright colors, unique styles and craftsmanship. The exquisite price mid-range fashion taste quickly swept the world.　　　　925 sterling silver platinum-plated 　　　　Silver is an unstable metal that will turn black due to external factors over time. At present, there is no way to prevent its change in the world. In modern jewelry circles, 925 silver is plated with platinum (rhodium) to effectively isolate 925 silver from contact with the outside air, so that 925 silver jewelry has the effect of platinum. According to the degree of personal maintenance, it can generally last 4-12 months. After that, it will become the effect of 925 silver itself, but it doesn’t matter if it gets black. You can wipe it with a silver wiping cloth, so that the 925 silver shine can be seen. 925 silver (plain silver) 　　　　 92.5% silver + 7.5% copper alloy is an internationally recognized standard for pure silver. It is usually plated with platinum (rhodium) to prevent it from turning yellow and black due to oxidation or vulcanization. 925 silver without platinum plating is called It is'Plain Silver'.　　　　 The above is the author's summary of the sterling silver information for you. The information comes from the Internet. If there is anything wrong, please forgive me. If you need sterling silver jewelry, please visit the official website of jewelry inlay. Jewelry inlay will serve you wholeheartedly!