The price of gold 999 is $489 to $510 per gram. As the price of gold is still rising, its price is not very stable, but is constantly fluctuating. : 1, 9999 pure gold is what it means 9999 pure gold refers to the gold content of not less than 99.99%, known as 10,000 pure gold. The number of gold symbols indicates its purity. For example, 999 is 1,000 gold, which means that there are 999 in 1,000 gold, and 9,999 is 10,000 gold, which is higher, which means that there are 999,999 in 10,000 gold, a difference of 10,000 parts of 9. 2, what does hard gold mean? Hard gold refers to physical gold, but it is made of new methods of "hard" gold. Its texture is harder than ordinary gold. It is also known as "thousand feet hard gold". 0.005% added special metal to increase its hardness, so as to achieve the corresponding hardness. Hard gold is hardened by a special process and refined by fire to become ordinary gold. Because the technology is different, the price will be more expensive.3, the difference between 9999 gold and 999 gold 9999 gold and 999 gold is the difference between purity: pure gold 999 is 99.9% gold, 9999 is 99.99% gold. The number of gold symbols represents its purity. 999 is one thousand gold, and gold is nine hundred and ninety-nine thousandths of a percent. 99.99 is ten thousand gold, which means that the purity of gold is ninety-nine million nine hundred and ninety-nine thousandths of a percent, a difference of nine thousandths. In gold jewelry, the most common is pure gold 999, because the material of gold is relatively soft, a lot of gold jewelry in the production of joints, buckles and other parts of the non-gold material to make the jewelry more solid, so that the overall purity will be reduced, it is difficult to achieve the pure gold 9999.Generally speaking, the purity of the gold bar or some of the simpler design of the process is pure gold 9999.And from 2017 August From August 2017, the new national standard stipulates that the forward and Wanjin will be called "pure gold", pure gold content must be greater than or equal to 99%. Therefore, in terms of gold jewelry, the difference between the two is not significant, and has little impact on the subsequent recycling of old gold. There is no need to discuss these differences too much. In fact, for the jewelry we wear, 999 gold is enough, whether it is the color, purity, and craftsmanship of thousands of gold has reached the highest level of jewelry. Do headdress words, because of the need to weld, generally 99.9% highest, said the fraudulent headdress 9999, gold bars are generally 9999. now the state regulations all gold jewelry should be labeled gold and gold, collectively referred to as gold. 4, the reason for the formation of gold:About 2.6 billion years ago, the ancient Zeus, volcanic eruptions will be a large number of gold elements from the core of the rock along the rift with the mantle and the crust, through the oceanic deposits and the role of regional metamorphism to form the original source of gold The original gold source was formed by marine sedimentation and regional metamorphism. About 100 million years ago in the Mesozoic Era, due to strong external forces, crustal deformation folded out of the sea, the gold material was activated and intensive migration, the formation of gold mining areas, that is, what we call rock gold. In areas rich in rock gold resources, the oxidation of rocks often leaves a large amount of natural gold. The superficial shallow rock gold is weathered and stripped into sandy soil after tens of millions of years. As gold is stable in nature, it is dissociated into monomers, which are deposited in the stable water of rivers during river transportation due to their large proportion, thus forming alluvial gold deposits. According to Song Yingxing's "Tiangong Kaiwu" of the Ming Dynasty, there are about 100 gold-producing areas in the country, which is difficult to enumerate. In the rocks, the large piece is called horseshoe gold, the middle piece is called olive and crotch gold, and the small piece is called melon gold. The large ones produced in water and sand are called nuggets, and the small ones are called bran or wheat gold. That which is dug in a well on level ground is called gold sand, and that which is dug in a well on level ground is called bucket gold. But they all have to be washed and smelted to become whole gold.