As long as you buy pure gold or thousands of pure gold in a regular store, there will be no problem with the quality of the goods. You can ask the clerk to show the relevant quality certificate when buying gold, or check the quality of the goods through an appraisal agency afterwards.

Gold quality standard

Gold quality standards stipulated by the national standard: gold with a gold content of ≥99% is pure gold, and gold with a gold content of ≥99.99% is pure gold. At the same time, there are also relevant regulations for K gold. The gold content of 8K gold is ≥33.3‰, 18K gold is ≥75‰, and that of 24K gold is ≥999‰. K gold has various colors, generally yellow, red and white. Among them, platinum is actually an alloy of gold and nickel, zinc, copper and other elements, rather than the usual platinum jewelry. Platinum refers to precious metal platinum (Pt).

Elements contained in precious metals and their alloy jewelry shall not be harmful to human health. Products in long-term contact with human skin (earrings, necklaces, bracelets, anklets, rings, snap fasteners, belt buckles, rivets, zippers and metal signs, etc.). ). The release of nickel from the long-term contact parts of these products with the skin must be less than 0.5 μ g/(cm 2. week). When jewelry is made of precious metals with different materials or purities, the materials and purities should be indicated separately.

Simple identification method:

1, check whether the gold has white bright spots.

Cut out gold bars or jewels and observe the section with a magnifying glass. Because gold and iridium can't be mixed together, if there are white spots, it means that gold and iridium are mixed in gold.

2. Measure the density.

Weigh a piece of pure gold on the scale. Then put the gold bars in a measuring cup and pour water to drown. Then put the detected gold bars into a measuring cup and observe whether the scale of water rises or falls. As long as there are changes, it can be said that gold bars are not pure gold. But the quality of gold jewelry can't be tested by this method, because there is air in gold jewelry.

3 calcination.

Put gold bars or jewels on the fire for a while and observe its changes. Due to the oxidation of iridium combined with oxygen in the air, the bands with lower purity will turn gray. On the other hand, pure gold will burn like bright red. However, this method may cause some damage to jewelry.