The main reason is that the process of extracting gold from K gold is difficult and the gold content is not as high as that of gold. 18k gold is an alloy with a gold content of at least 75%, that is, an alloy with a gold content of 18/24, and the remaining 25% is other precious metals, including platinum, nickel, silver and palladium. 18K gold is a kind of gold ornament with low cost and comfortable wearing.

There are two main reasons:

First, it is difficult to detect and lacks testing equipment.

Spectrometers used for gold detection are generally expensive, ranging from tens of thousands to hundreds of thousands, which is undoubtedly a big expense for gold shops, especially those small ones. Can't afford such expensive equipment, the gold shop will directly use the most primitive detection method for gold recovery. In addition, the composition of K gold is more complicated than pure gold, and the detection is more difficult, so most gold shops are reluctant to recycle it.

Second, gold skill recycling is not professional.

There are many businesses doing gold recycling in the market, and the recycling process and recycling price are very different. In addition, most operators who do gold recovery have not received systematic training, so they have no experience in recovering 18K gold.

18K gold profile;

The calculation method of K gold is to divide pure gold into 24 parts, and 24k gold is pure gold, but in reality, it is impossible to have 100% gold, so China stipulates that gold with a content of more than 99.6% can be called 24K gold.

In theory, 100% gold can be changed into 24K gold, but in reality, it is impossible to have 100% gold, so China stipulates that gold with a content of more than 99.6% (including 99.6%) can be changed into 24K gold. These kinds of K gold contents are general specifications of jewelry, and gold jewelry below 9K is not called gold jewelry according to national regulations. Some gold ornaments are marked with words, which stipulate that the gold content is not less than 99% and the gold content is greater than 99.9%.

In China, the imprint and identification card of gold products are stipulated. Generally, it is the manufacturer's code, material name, content stamp, etc. They are all necessary, and products without marks are unqualified. The same is true internationally. But for some very small products, it is also allowed to be unmarked. The gold seal of 18K is generally AU750, 18K or G750.