Every one has it, which is made by the manufacturer to prevent counterfeiting and distinguish it from other manufacturers. If it is stamped with the manufacturer's seal and gold content, it must be produced by the original manufacturer, and its quality and purity are better than others; If it is a brand of laser printing, the gold content of steel printing is definitely not produced by itself. The goods sold in this store are not from their own brand factory, so there will be jewelry (gold content+other factory code letters) and it will be printed in steel, and the brand of laser printing will be added by the latter. By comparing the two, we can know the authenticity.

Extended data:

1, gold identification can burn jewelry, and observe its color change after cooling. If it is pure gold, the surface is still golden yellow after burning. If the color is black, it is not pure gold. However, pay attention to observation when burning, and don't burn the jewelry out of shape.

References:

Baidu encyclopedia-Lao Fengxiang