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.
Extended data:
Maintenance method
1. When wearing a diamond ring inlaid with 18K gold, try to avoid contact with chemicals.
2. Avoid collision or friction between the diamond ring and hard objects such as metal.
3. Avoid placing the diamond ring in an environment that is too cold or too hot.
4, often gently wipe with a soft cloth, but avoid cleaning with hand sanitizer containing chemical components.
China has regulations on the imprint and identification card of gold products, which generally require the manufacturer's code, material name, content imprint, etc. 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.
Because it contains 25% other metals, 18K gold can also be made into different colors, such as white, yellow and rose red, which are called white 18K gold, 18K rose gold respectively.
Baidu encyclopedia-18k gold