Gold can only be composed of ternary alloys of gold, silver and copper, and yellow is the true color of gold, which is the color of most jewelry commercial gold. Yellow series K-gold jewelry (yellow K-gold for short) is an alloy of gold, silver and copper. According to the gold content, K-gold jewelry with different K numbers can be made, mainly including 22K, 18K, 14K, 10K, 8K, etc. The color depth of yellow K-gold jewelry series is related to the gold content in K-gold and the ratio of silver to copper. 18K gold is yellower than 14K and 10K gold jewelry, while gold jewelry with the same number of k is lighter if silver is lighter than copper yellow, and darker if copper is silvery yellow.

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White series K gold jewelry

Platinum series gold jewelry (referred to as platinum) is slightly bluish white, and its imprint is marked with WG imprint. According to the combination, it can be divided into the following two types: the first alloy, mainly gold, is composed of silver, nickel and zinc, which is called platinum in business circles. 18K K gold consists of 75% gold and 25% silver, nickel and zinc. 14K platinum is an alloy consisting of 58.5% gold and 4 1.5% silver, nickel and zinc. The second is an alloy consisting mainly of gold and palladium, plus copper, nickel and zinc. Internationally, this title is based on the share of each metal in gold. At present, there are only two varieties. 334K platinum consists of 3 parts of palladium and 4 parts of copper, nickel and zinc, and 226K platinum consists of 2 parts of gold, 2 parts of palladium and 6 parts of copper, nickel and zinc.

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Red series K gold jewelry

Red series K-gold jewelry is mainly made of gold and copper, with a little silver added. Red in color (refers to rose gold). Rose-red K gold can use ternary alloy of gold, silver and copper, but with the increase of copper proportion, the color is close to the tone of copper, which is not very bright.

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Color series K gold jewelry

Color series K-gold jewelry is made by pressing different colors of K-gold into sheets, arranging them in opposite directions according to different colors, and forging the sheets together. The alloy of gold and aluminum can become bright red K gold. If the proportion of aluminum is reduced to form purple gold, its lavender is very attractive. Both materials are brittle and difficult to process.

The ternary alloy of gold, silver and copper can form green K-gold, and almost all of them can form green K-gold by adding 2%-4% cadmium, which leads to green color.

The alloy of gold and iron can be turned into blue gold, but its manufacturing process is extremely confidential and has been patented all over the world. It is said that the surface of K gold is implanted with cobalt atoms.