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‰
Dress carefully
1. Although gold has a high durability, if you don't care about jade, there will still be scratches or pits on the surface of gold jewelry, especially jewelry worn on your hands, such as rings and bracelets. So remember to take off the gold jewelry before doing strong activities.
2. Pay attention to chemicals. The natural enemy of gold is liquid chlorine. Repeated exposure to chlorine will weaken the internal structure of gold and eventually lead to fracture. So keep your gold jewelry away from chlorine-containing detergents, swimming pools and bathtubs.
3. The chemical components such as acid and abrasive contained in the cleaning liquid at home will damage the luster of the surface of gold jewelry, so remember to wear rubber gloves when cleaning under heavy tasks, and of course it is best to remove them.
4. Gold jewelry has been polluted by cosmetics such as sweat, dust and perfume for a long time, and it is easy to lose its original luster, so it should be cleaned regularly. You can wash it with mild soapy water or go to a professional jewelry store for steam washing. After cleaning and rinsing, be sure to wipe it with a suede or clean soft cloth to avoid scratches.
5. Proper storage is as important as cleaning. When not in use, put it carefully in the jewelry box-it is best to wrap a soft cloth-and it is best to store all kinds of jewelry separately to avoid entanglement or friction.
6. Check whether the gold jewelry is cracked or damaged at any time, especially the retaining ring-elastic, safe and reliable; Claw-avoid breaking, bending or loosening, and prevent the gem from falling off; Earrings and needle backs-avoid bending or loosening, and the joints of long-term hanging ornaments such as wedding rings and pendants.