K-gold refers to the alloy of gold and other metals mixed together, because its English is karat gold, so it is referred to as K-gold. For the precious metal part, pure gold is 24K, but it is too soft to make watches. It must be mixed with other metals to enhance the hardness. Generally, silver, copper and palladium are the main metals. However, no matter what kind of metal is mixed, the proportion of pure gold accounts for 75%. With the proportion of gold, silver and copper, five kinds of materials with different colors can be produced. The content of copper is represented by N. for example, the red gold with the highest copper content is represented by 5N, while the correct expression of platinum is white K gold.
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