According to the national standard GB 1 1887-89, the gold content of each opening (abbreviation for carat in English, karat in German, often written as "K") is 4. 166%. Therefore, the gold content of each opening is (GB in brackets):

8k=8*4. 166%=33.328%(333‰)

10k = 10 * 4. 166% = 4 1.660%(4 17‰)

14k = 14 * 4. 166% = 58.324%(583‰)

20k = 20 * 4. 166% = 83.320%(833‰)

24k = 24 * 4. 166% = 99.984%(999‰)

Thousands of pure gold: the gold content is not less than 999%, and the words "thousands of pure gold" or "Au999" are engraved.

Pure gold: the gold content is not less than 990%, and the words "pure gold" or "Au990" are engraved.

Extended data

Jewelry made by adding other metals (such as silver and copper) to gold materials is also called gold. Due to the number of other gold ornaments added, different kinds of gold ornaments have been formed.

Among gold jewelry, pure gold jewelry is soft in texture, with teeth marks, easy to bend, golden in color, pure and soft, and heavy in touch. K-gold jewelry is hard and toothless, and its color is yellow with white, and with the decrease of gold number, the white gradually increases and the yellow gradually becomes lighter. The handle of gold jewelry is not as heavy as pure gold jewelry.

In addition, whether it is pure gold or k gold, there is a seal, and the seal on the gold jewelry is represented by a gold character or an English letter. Marked with the corresponding k number.

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