Great Wall gold bars with China banknotes are very collectible. When collecting and buying this kind of gold bars, we should pay special attention to many factors, such as price, issuer, production technology, casting institutions, limited issuance, repurchase and so on. At present, the production technology of gold bars can be divided into "casting" and "oil pressure". Relatively speaking, the pattern of "oil pressure" is more delicate and clear.

I. Gold

1, 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 speaking, gold in the world is measured in ounces. In ancient China, gold was measured in ounces, which was 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.

2. Ten thousand gold: that is, the gold content is not less than 99.99%, commonly known as "49 gold". Generally, "49 gold" is rarely used as gold jewelry. However, it is not listed in the national standard, but the imprint is Wanjinjin, 9999 gold, AU9999 or G9999. Tiger balm is red and yellow.

Second, the difference between gold 999 and 9999

The difference between 999 and 9999 is mainly the difference in purity. 999 contains 99.9% gold, and 9999 contains 99.99% gold. But if you make jewelry, 99.9% is the highest, because it needs welding. It is said that jewelry 9999 is a fool, and gold bars are generally 9999. To say that the price of gold 999 and 9999 is different? In fact, there is basically no difference between the prices of 999 and 9999. Generally, the raw materials of big brand jewelry are 9999 gold nuggets, and the jewelry made can only be 999 thousand gold or gold.

Third, the difference between 990 gold and 999 gold

990 gold is pure gold with a gold content of 990%, and 999 gold is pure gold with a gold content of 999%, so the gold content of the two is different, the gold content is different, and the price will be different. Now the national unified standard, the labels of pure gold and thousands of pure gold are all marked with pure gold, but there are still some differences in weight. The hardness of gold 900 and gold 999 is also slightly different. Pure gold is soft and malleable. The higher the gold content, the softer and more brittle it is, so gold 999 is softer than gold 900.

Fourth, the difference between gold and pure gold.

First of all, we must know that pure gold belongs to gold. Specifically, if the gold content is greater than or equal to 99%, it belongs to the inclusion relationship. The main factor that can determine the price of gold is purity. The higher the purity, the higher the price. It is reasonable to say that the price of pure gold is more expensive, but the 18k gold of some international jewelry brands is still very expensive. Pure gold is a kind of gold, so it is impossible to compare the prices of gold and pure gold.