As long as the gold content of jewelry in brand stores is high or low, the highest gold content is Wanjinjin, also called Wanjinjin, with a gold content of 99.99%, and there are also small gold shops, but the jewelry in brand stores is made by big manufacturers, and the workmanship is not small!
Gold is a simple form of chemical element gold (Au), which is a soft, golden yellow and corrosion-resistant precious metal. Gold is a rarer, more precious and more valuable metal. Generally, gold in the world is in ounces. In ancient times, gold was in ounces, which is a very important metal. It is not only a special currency for reserve and investment, but also an important material for jewelry industry, electronics industry, modern communication and aerospace industry.
The chemical symbol of gold is Au, and the financial English code is XAU or gold. The name Au comes from a story of Aurora, the goddess of dawn in Roman mythology, which means shining dawn.
As of 202 1, 10, 12, the gold price is 1760 USD/oz.
Gold operation method
The first type: if it is your own brand of gold recycling, you can go to your own store to recycle gold. Generally, the loss is not calculated, but a small amount of processing fee is required (recommended).
Second, if you accept other brands of gold ornaments for trade-in, the loss will be calculated. Because of brand differences, the loss will be in direct proportion (take a brand of jewelry as an example, it will give you a 10% discount on the original weight, such as the original weight10g, and 9 grams after the discount).
The third type: go to the gold processing shop and reprocess the latest model, without calculating the loss or forcibly increasing the gold purchase. Only some cost will be charged, but due to the different calculation methods, consumers had better calculate accurately before starting. (In addition, some merchants will deduct a little gold and need to confirm the weight of gold in person).
physical features
1, color:
The steam released when gold melts is green; Its gold powder is usually brown when it is melted; If it is cast into thin slices, it can transmit green light. golden
2. Extensibility:
Extremely powerful. 1 oz gold can be stretched to 50 miles long, and its ductility makes it easy to cast, making it a good choice for making jewelry. Of all metals, gold has the greatest pulling force.
3. Extensibility:
Second to none. It will cause extremely thin gold sheets to roll up easily. Gold weighing 65,438+0 ounces can be hammered down to 65,438+0 _ 4 million and 65,438+000 square _ area. The ancients hammered it into thin slices and threw it into temples and palaces for decoration. All these can show that gold is extremely flexible and plastic.
The color of gold is golden yellow, which has a metallic texture and is not easy to decompose. Hardness 2-3, pure gold 19.3, melting point1064.4℃; Good ductility, can be pressed into thin foil, and has extremely high heat and thermal conductivity. The resistance of pure gold is 2.4p Pure gold has good chemical resistance and is the best electroplating material.