1, conceptually:

Gold ornaments are usually divided into pure gold and thousands of pure gold. Among them, the purity of "Sanjiu Gold" is 99.9%, commonly known as thousands of gold; "Erjiu Gold", with a purity of 99%, is commonly known as pure gold. Pure gold is a kind of gold, and when you say gold, you should mean thousands of pure gold.

2. On the logo:

Most of the gold ornaments on the market are equipped with inspection marks of quality inspection institutions, which clearly indicate the material and purity of precious metals. The marks of pure gold are "Thousands of Pure Gold", "999 Gold", "Gold 999" and "G999"; The imprint of pure gold is "pure gold", "990 gold", "990 gold" and "G990".

3. Color:

The higher the purity of gold, the darker the color. Visually, the color of gold is red and yellow, and the fineness is generally above 95%. Pure gold will shine brightly when placed in strong light.

4, feel:

Compared with ordinary gold, silver and copper with the same volume, thousands of gold is obviously heavier. Holding it in your hand has a heavy feeling, which is what people call "gold falling into your hand."

5. On the sound:

Thousands of gold with high fineness are thrown on the ground without rhyme and elasticity, while gold with low fineness is slightly brighter in sound quality, and other metals such as copper products are thrown on the ground loudly. So we can tap gold and distinguish thousands of pure gold from gold according to the sound.

Extended data:

Thousands of pure gold, pure gold, 22K, 18K,14k-Pay attention to the quality inspection mark when buying gold jewelry.

1, 999 gold is also called thousands of gold, and the gold content is not less than 999 ‰; 990 gold is called pure gold, and the gold content is not less than 990 ‰; The gold content of 22K gold is not less than 916 ‰; 18K gold has a gold content of not less than 750 ‰; 14K gold has a gold content of not less than 585 ‰; The gold content of 9K gold is not less than 375‰.

2. It is particularly important to note that 18K gold ornaments have three colors: yellow, white and red. White 18K gold is an alloy of gold and nickel, zinc, silver, copper and other elements, while platinum jewelry is not platinum (platinum) products.

References:

Gold-Baidu Encyclopedia? Gold-Baidu Encyclopedia