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wholesale china 18kt yellow gold jewelry The history of human use of currencies produced in the era of material exchange. In the primitive society, people use objectives to exchange the materials they need, such as a sheep to change a stone ax. However, sometimes restrictions on the types of materials used for exchanges have to find a item that can be accepted by both parties. This item is the most primitive currency. Livestock, salt, rare shells, rare bird feathers, gems, sand gold, stones and other items that are not easy to obtain in large quantities have been used as currencies. Gold Currency
The metal currency
has been eliminated for many years, and in most society, items used as currency are gradually replaced by metals. The advantage of using metal currencies is that its manufacturing requires manual, cannot be obtained from nature, and is easy to store. Copper with scarce gold, silver, and smelting difficulties has gradually become the main currency metal. Some countries and regions have used iron currencies. Early metal currency was blocking. When used, it was necessary to test the color with test stones, and at the same time weighing weight. With the development of human civilization, a more complicated and advanced currency system has gradually established. People in ancient Greece, Rome, and Persia cast a unified coin with weight and unified color. In this way, when using currency, there is no need to weigh weight or test color, which is undoubtedly much more convenient. These coins have a king or avatar, complicated coat and seal patterns to avoid forgiveness. The earliest metal currency in China was the copper shell of the Shang Dynasty. The Shang Dynasty was also known as the Bronze Age in the history of our country. At that time, the well -developed bronze smelting industry promoted the development of production and the increase in trading activities. Therefore, at that time, due to the instability of the source, the transaction was inconvenient to cause the transaction, and people were looking for more suitable currency materials. Naturally, it was concentrated on the bronze, and the bronze coins came into being. However, this kind of metal currency made with bronze is rough in production, simple design, unsatisfactory shape, no use units, and no extensive use in the market. Because its shape is very similar to the shell coin of currency, most people call it copper shell. Gold Currency
In the analysis of archeological materials, after the generation of copper shells, it circulates at the same time as shell coins. Copper shells have developed into the middle of the spring and autumn, and new currency forms have appeared. The appearance of a thin layer of gold is luxurious and wear -resistant. Copper shell is not only the earliest metal currency in my country, but also the earliest metal currency in the world.