I. Gold
1. Gold, as the common currency metal of national gold, has the function of preserving and storing value, and its price is deeply influenced by the international economy. For example, the trend of the dollar, inflation and so on. For example, the trend of the dollar: when the trend of the dollar rises, the rise means that the dollar rises, and investors or speculators buy a lot of dollars, resulting in a decrease in the demand for gold and a decline in the price of gold; On the contrary, the dollar is falling, and the dollar is worthless. People have invested in gold, seeking advantages and avoiding disadvantages, which leads to the rise of gold price.
2. The local currency will also have money and no market because of the shortage of materials, leading to currency depreciation. At this time, gold played a very important role as a currency to avoid risks. People with financial ability will convert money into gold in advance, and a large amount of gold exchange will make the price of gold rise. International gold prices will also rise.
3. Gold pure gold jewelry has soft texture, tooth marks, easy bending, golden color, pure, soft, heavy and heavy feeling. K gold jewelry is slightly hard and toothless, and its color is yellow with white. With the decrease of K number, the white gradually increases and the yellow gradually becomes lighter. K gold jewelry is not as heavy as pure gold jewelry. In addition, pure gold and K gold jewelry are stamped. The English letters & quotkg on gold ornaments are both "gold" and useful, indicating the texture.
4. When indicating the gold content, use & Quot99 "or & Quot24K" to indicate pure gold jewelry, and K-gold jewelry shall indicate the corresponding K number according to the different gold content, such as & Quot 18K "K-gold jewelry, whose gold content is 75%. In addition, there are seals on the jewelry, indicating the origin of different manufacturers. Real gold jewelry, with standard, complete and clear seal, is an important identification mark. There are many kinds of jewelry that are easily confused with gold jewelry, including gold-plated jewelry, gold-plated jewelry, copper jewelry, copper alloy jewelry and so on.
Ii. 9 1 metal
9 1 The metal quotation covers silver, gold, gold bars, platinum, palladium powder, rhodium powder, ruthenium powder, refined indium, magnesium ingot, electrolytic cobalt, metallic lithium, electrolytic copper, aluminum ingot, lead ingot, zinc ingot, tin ingot and electrolytic nickel, and the price is for reference only.
Third, the maintenance method
1, cleaning chemicals will change the color of gold, so take off the gold ornaments before cleaning.
2. Avoid direct contact with volatile substances such as perfume and hair gel, otherwise it will easily lead to the fading of gold ornaments.
3. Take off the gold ornaments when swimming to avoid chemical changes on the surface after contact with seawater or pool water.
4. Wrap it in flannel and put it in a jewelry box when keeping it to avoid mutual friction and damage.
5. Gold is soft and easy to deform. Do not pull necklaces and other accessories to avoid deformation.
6. Pure gold jewelry will react chemically when it encounters mercury, and white spots will appear. When cleaning, as long as you barbecue under the alcohol lamp for a while, it will return to its original color.
7. After wearing, gold ornaments often lose their luster due to stains and dust. At this time, just put the gold ornaments in a neutral detergent, soak them in warm water, and then take them out and dry them.