At present, there are three kinds of popular K-gold series on the market: yellow series, white yarn series and color series.
1. The yellow series of K-gold jewelry is an alloy of gold, silver and copper. The color depth of gold jewelry series is related to the gold content and the ratio of silver to copper. If the content of silver is higher than that of copper, the yellow color is lighter.
2. White series K-gold jewelry is gold, silver, zinc and nickel alloy with gold as the main component, and the outer layer is plated with white rhodium, which is customarily called white K-gold. For example, the common 18K platinum in the market consists of 75% gold and 25% silver, zinc and nickel.
3. The color series of K gold is to add a small amount of color-developing metal elements to the alloy of gold, thus making the color of K gold rich and colorful. At present, the colored K-gold ornaments on the market are all made by pressing different colors of K-gold into sheets, then alternately arranging different colors of gold sheets with the same K number, and finally forging and pressing.
2. Platinum Platinum, commonly known as platinum, is a more precious metal material than gold. The global annual supply of platinum is only 1/20 of that of gold. Its chemical element symbol is Pt, its hardness is 4.3, its specific gravity is 2 1.45g/cm3 at 20℃, and its melting point is 1768℃. Platinum has many excellent properties, such as high hardness, oxidation resistance, corrosion resistance and never discoloration. However, in order to make jewelry more suitable, palladium is usually added to platinum by 5% to 10%, and almost all platinum jewelry sold in the market is platinum-palladium alloy with platinum content of 90% and 95%.
Third, is platinum platinum platinum? Many investors regard platinum as platinum, and some businesses simply make a mistake and call platinum platinum. It is misleading to say it is light, but deceptive to say it is heavy. So many investors found that they bought gold instead of platinum they needed. Therefore, for a long time, white gold was regarded as a fake and suffered injustice.
1. First of all, we should know that platinum is an alloy of gold and other metals, and the real platinum is platinum.
2. Learn to read the product logo. According to national standards, the name and color of precious metals should be indicated on the logo of each jewelry product. According to the national standard, gold or G prefix should be added before the purity of gold jewelry is one thousandth or k number. For example, G750 Gold 750, G 18K Gold 18K all represent K gold with 75% gold content; Platinum ornaments will be labeled with platinum or Pt before the purity is 1000, such as platinum Pt900, indicating that the platinum content is 90%. In particular, the content of platinum will not be expressed by K number, only gold will be expressed by K number.
3. Pay attention to the steel seal of jewelry. Regular manufacturers will stamp the hidden place of jewelry with steel seal, indicating the fineness of precious metals, and the expression of fineness is the same as above.
4. appearance observation, white K.