Gold has four nines, but it is not 9999 gold but 999.9 gold. The numerical mark of gold represents the purity of gold. The three nines are pure gold, and the gold content is not less than 999. Its mark is pure gold, 999 gold, gold999 or g999. The four nines are ten thousand pure gold, and the gold content is not less than 999.9. Its mark is ten thousand pure gold, 999.9 gold, AU999.9 or G999.9.

The difference between ten thousand pure gold, one thousand pure gold and pure gold. When buying gold jewelry, you must first understand the quality inspection mark of gold jewelry. Gold jewelry sold on the market should be equipped with an inspection mark from a quality inspection agency, which clearly indicates the gold content and weight of the jewelry.

999.9 gold is called ten thousand pure gold, and its gold content shall not be less than 999.9‰;

999 gold is also called thousand pure gold, and its gold content shall not be less than 999‰;

< p>990 gold is called pure gold, the gold content is not less than 990‰;

The gold content of 22K gold is not less than 916‰;

The gold content of 18K gold is not less than 750 ‰;

The gold content of 14K gold is not less than 585‰;

The gold content of 9K gold is not less than 375‰.

Pure gold: Gold with a gold content equal to or greater than 990‰, commonly known as "Twenty-Nine Gold". The mark is "Pure Gold", or "99 Gold" or "G99", etc.

Thousand Pure Gold: Gold with a gold content equal to or greater than 999‰, commonly known as "Three Nine Gold". The mark is "Thousand Pure Gold", or "999 Gold" or "G999", etc.

Thousands of Pure Gold Pure gold: gold with a gold content equal to or greater than 999.9‰, commonly known as the "10,000 pure gold series" and marked with "10,000 pure gold" or "999.9 gold", etc. Therefore, ten thousand pure gold is definitely one thousand pure gold, but one thousand pure gold is not necessarily ten thousand pure gold.

Reference materials: Sogou Encyclopedia-Wanzujin Sogou Encyclopedia-Qianzujin