Is it true that Zhongyu Yishan Gold?

It's true. Business scope of Beijing Tongzhou District Market Supervision Administration: sales and online operation of jewelry, daily necessities, clothing, shoes and hats, knitwear, electronic products, mechanical equipment, communication equipment, computer software and auxiliary equipment (online retail only); Retail trinkets, handicrafts (excluding cultural relics), clocks, ceramics, leather products, bags, sporting goods (excluding crossbows), toys, baby products, household appliances, cosmetics, personal hygiene products, gold products, silver products, stationery products; Economic and trade consultation; Enterprise planning; Undertaking exhibitions; Import and export of goods. (Market entities independently choose business projects and carry out business activities according to law; Projects that must be approved according to law shall, after being approved by the relevant departments, carry out business activities in accordance with the approved contents; Shall not engage in business activities of projects prohibited or restricted by the industrial policies of the state and this Municipality. )

Gold classification:

1, pure gold, thousands of gold

Pure gold and thousands of pure gold are pure gold. Symbol: Au countries have very clear regulations on every gold jewelry sold by merchants, and gold jewelry must be listed to indicate its gold content and weight. Pure gold with a gold content of not less than 99% is called pure gold, which means that the gold content is not less than 99.9%. Pure gold is dark yellow, commonly known as Erjiu, and pure gold is Sanjiu. However, pure gold is generally not inlaid with gems because of its low hardness.

2. Platinum

Strictly speaking, platinum has nothing to do with gold. Platinum is an extremely rare metal. It is white, hard, never fades and has permanent value. Usually with diamonds. Also known as platinum symbol: According to the regulations of Pt country, only jewelry with platinum content of more than 85% can be called platinum jewelry, and it must bear the Pt symbol.

3, 3D hard gold

3D hard gold or hard gold refers to the improvement of pure gold in the processing process (by increasing the gold content, PH value, working temperature, organic photoinitiator content and stirring speed in electroforming solution, the hardness and wear resistance of gold are greatly improved), so that it has high hardness, good color of finished products, and is easy to be polished into various shapes, which overcomes the shortage of hardness of pure gold.

Disadvantages because the processing technology is complex, it will be more expensive.

4, K gold, white K gold

K gold is a symbol of gold ornaments with different gold contents. The gold content of 1K is about 4. 166%, so the gold contents of 24K, 22K, 20K and 18K are 99.99% (pure gold), 9 1.65%, 83.32% and 74.98% respectively. The rest can be multiplied by 4. 166% by k to get the gold content. Platinum is not gold, but platinum is added.

5. Gold plating

Gold plating means that other metals are coated with gold.

6. Lottery bonus

Colored gold, also known as colored gold, is made by adding a variety of non-ferrous metals to gold. The price will be more expensive with the rarity and strangeness of the color, which is different from hard gold and can be recycled.