Thousands of gold with a gold content of not less than 999 is called thousands of gold, which is the highest value in jewelry color naming. The stamps are thousands of gold, 999 gold, 999 gold or g999 gold. The imprint of gold jewelry includes manufacturer's code, material and purity, such as X Gold 990, XAu990 and X Pure Gold. Where the letter X is the manufacturer's code. When jewelry is made of precious metals with different materials or purities, the materials and purities should be indicated separately. When jewelry is too thin or too small to print, it should be accompanied by a logo containing the contents of the imprint. On the eve of the Spring Festival of 20 15, the National Standardization Administration Committee published the revision of GB 1187-2012 "Provisions and Naming Methods of Precious Metals in Jewelry", which took effect on May 4, 2000/6. In the future, even gold with a purity of 999.0‰
How to choose thousands of gold jewelry with good color? Common cooked gold has a formula for identifying clear gold, that is, weighing, looking at color, judging melody, folding soft and hard.
1. Because the density of gold is obviously higher than that of common metals such as copper, silver, lead and zinc, it is about twice as heavy as that of silver and copper with the same volume. If the object is gold and feels heavy, it is a "golden pendant" of the human system, and vice versa.
2. Thousands of pure gold has its unique golden luster (except low fineness). Pure gold will shine brilliantly in strong light, which other metals, including copper, do not have.
3. Thousands of gold with high color are thrown on the ground without rhyme and elasticity, while thousands of gold with low color are slightly brighter in sound quality, and copper products are thrown on the ground loudly. Therefore, according to the sound of knocking objects, it can help us distinguish ordinary metals from gold.
4, thousands of gold has the characteristics of good ductility and low hardness. Pure gold is soft, and copper bars are hard to fold. Or draw it with a pin (nails can also be used). If the strength is not great and the trace is obvious, it is gold and pure gold, and the copper is slightly harder and the trace is slightly worse.
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