The gold necklace is the first ornament made of gold material, which is usually hung around the neck for decoration.
Selection method of gold necklace:
First of all, ask about the specific content of gold, because there is some 39 gold, and its purity is 99.9; Some are 49 gold, and its purity is 99.99, which belongs to high purity gold. 99.99 is more expensive than 99.9. There are also different brands, and the prices are naturally different. And their pricing is actually the actual price of gold plus their processing fees!
Then identify it yourself. Our common cooked gold has a formula to identify clear gold, that is, weighing, looking at color, judging rhyme, folding soft and hard, and using acid points. Because the density of gold is obviously higher than common metals such as copper, silver, lead and zinc, it is about twice as heavy as 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. ?
Gold has its unique golden luster (except for those with low fineness). Pure gold will shine brilliantly in strong light, which other metals, including copper, do not have. ?
Gold with high fineness has no charm and elasticity when thrown on the ground, while gold with low fineness has a slightly brighter sound quality, and copper products are thrown on the ground with a loud sound. Therefore, according to the sound of knocking objects, it can help us distinguish ordinary metals from gold. ?
Gold has the characteristics of good ductility and low hardness. Pure gold is very soft to fold, and copper bars are very laborious to fold. Or draw it with a pin (nails can also be used). The strength is not great, and the trace is obvious, but the copper is slightly larger and the trace is slightly worse. Soft folding and hard folding are only applicable to rings, gold wires and the like, and gold bars, gold coins and gold bricks are more difficult. It is also very effective to judge the authenticity of gold with a grinding head, but it is necessary to polish the inspected object in different directions. If the colors of several grinding channels are obviously different, there is no doubt that they are adulterated. ?