Gold jewellery refers to jewellery made from gold as the main raw material. It can be divided into pure gold and K gold according to its gold content: the gold content of pure gold jewellery is over 99% (99% is the usual gold, 99.9). % is thousands of gold, and the gold bars we buy are generally 99.99%, and there are also 99.999% high-purity gold); K-gold jewelry is made of other metals such as silver and copper metal in its gold material. According to the gold content, it is divided into different K numbers, such as 18K (the gold content is 75%). The former is expensive and has a value-added function, while the latter is much cheaper.
1, see the density
It is possible to calculate the density of the gold jewelry measured by the formula "the quality of a certain gold jewelry (g) / the volume of a certain gold jewelry (cubic centimeter) = density". The density is about 19.32 g / cm 3 and it is pure gold or Pure gold, otherwise it is non-pure gold or color difference gold.
2, folding hardness
The high-quality nails are used to leave traces. More than 97% of the gold jewellery is bent. After bending two or three times, wrinkles appear at the bends. 95% of the gold jewellery is hard. When bent, it feels hard, about 90% of the color. Gold jewellery is very hard when bent, and gold jewellery containing more impurities is broken two or three times.
3, see the color
Generally speaking, according to the different luster and color of gold, it can be roughly distinguished from pure gold, K gold, real gold and fake gold. She said, "Gold is better than red and yellow, and the color is more than 95%."
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