The theme of gold jewelry

How much do you know about the most common knowledge of gold? Introduction to the origin of the gold origin industry 2007-10-25 12:24 Read 65 Comments 0-character size: Large medium, medium and small gold is one of the earliest metals discovered and used. Humans had identified gold as early as the Neolithic Age (about 10,000 to 4000 years ago). In the middle of the middle of the Shang Dynasty (14th to 13th centuries BC), China has mastered the skills of making gold wares. Yin Shang cultural relics unearthed in Anyang and other places in Henan have gold foil. "Zhou Li · Di Guan" said: 卝 (sound mine) people are in charge of Jinyuxi. This is the earliest record of ancient literature on mining and metallurgical. According to legend, with the development of business during the Warring States Period, gold has become a currency of the pass, and the needs of the luxurious life decoration of the feudal ruling class will increase. In the Spring and Autumn Period, the "Tube · Land number" articles entrusted by Qi Xiangzhong had "there are Dan sand, gold with gold on the bottom; there are magnets, and copper."
gold is also known as gold, English GOLD, chemical symbol AU, atomic order 79, it is an orange -yellow metal substance. In nature, gold exists in a single form.
1. Features
The density is very large. The density is often pressed. The density of gold is 19.32 grams / cubic centimeter, which is nearly 20 times the water and more than 3 times the iron.
The melting point and boiling point are very high, the melting point is 1064.43 ° C, and the boiling point is 2808 ° C. As the saying goes: "Real gold is not afraid of fire."
Mo's hardness is 2.5, which is comparable to human nail hardness.
The toughness and ductility. One gram of pure gold can be pulled into a filament of more than 3000 meters, and it can also be forged into a 9 -square -meter gold foil.
The stability is high, and the corrosion resistance capacity is extremely strong. Except for the king's water, it is insoluble in other acid -base solutions. The golden funerals unearthed in ancient tombs, although thousands of years of storms, are still colorful as new.
. The method of expressing the color of gold
The goldenness of gold is the purity of gold, which refers to the content of the golden element in the golden items. There are two types of popular golden colors:
K gold method:
is to refer to the gold content of 100%of the gold (LK = 4.1666%), and the gold content of 18K gold is 75%. , 14K gold content 50%, 9K gold content 37.5%.
The proportion method:
is expressed in a percentage and thousands of points. For example, AU99.95 is gold with gold content of 99.95%, and AU999.5 is gold with a gold content of 999.5 ‰.
. The unit of gold
1. The golden system ode system in Europe and the United States.
1 Gold Health = 31.103495 grams
2. The two systems of Hong Kong, Japan, and ancient China.
1 Sima Two = 37.42849791 grams
1 Japan two = 3.75 grams
1 clock pound = 16 small two = 500 grams, 1 two = 31.25 grams
. Municipal measurement unit unit Essence Now the gram of Shanghai Gold is a unit.
1 clock kit = 10 two = 500 grams
4. Toral system such as New Delhi, Karachi, Mumbai, etc.
1. London gold market, founded in 1919, is the world's largest spot trading center. There is no fixed exchange in the London gold market, and its transactions are mainly completed through the invisible way -the sales liaison network of major gold merchants. The transaction members are composed of their authoritative five gold merchants and some companies are recognized as companies or business names that are qualified to buy gold from the five major gold merchants. During the transaction, the gold merchants reported the purchase price and selling price based on their respective buying and buying. The five major gold merchants in the London Gold Market are:
1) Luo Fuqi
2) Jinbaoli
) Pacific
The Golden Market in London is issued two fixed prices every morning (7:30) and afternoon (3:00). These two fixed market prices are important instructions for the global gold market.
2. The US Gold Market
The New York Commodity Exchange (COMEX) and the Monefavry Fmarkket in Chicago (IMM) is the world's largest gold futures trading center, which is Global gold futures transactions are the most active and the largest market. Taking COMEX as an example, the daily transaction deposit of 30,000 contracts. COMEX's gold price is an important reference for gold spot prices around the world.
3. The Shanghai Gold Exchange was established on October 30, 2002. It is an important sign of China's gold management system reform, gold marketization, and the end of the national unified purchase system.
The first batch of members of the Shanghai Gold Exchange was scattered in 26 provinces and cities and autonomous regions in the country; of which 13 commercial banks, 31 gold and smelting units, 61 gold units, and 3 mint units. The transaction time is from 10:00 to 11:30 am from Monday to Friday (except legal holidays), from 13:30 to 15:30 pm. The transaction method adopts a member system. The minimum transaction volume is 1 kg, and the transaction volume must be an integer multiple of 1 kg.
Due to the restrictions on the trading rules of the Shanghai Gold Exchange, ordinary natural person investment consumers cannot directly participate in the gold trading of the Shanghai Gold Exchange. Small specifications (more than 10g) gold investment consumption varieties set up bridges for natural persons to participate in gold trading. What I know is that I hope to help you make your own research