1, pure gold, thousands of gold

Pure gold and thousands of pure gold are pure gold! Symbol: Au? The state has very clear regulations on every gold jewelry sold by merchants, and gold jewelry must be listed to indicate its gold content and weight. 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, because of its low hardness, pure gold is generally not inlaid with gems. It is generally pure gold jewelry made of pure gold, and of course it also has the functions of recycling, collection and storage.

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: Pt? According to the national regulations, only jewelry with platinum content above 85% can be called platinum jewelry, and it must be marked with Pt. Platinum jewelry usually bears the purity marks of Pt850, Pt900, Pt950, Pt990 or Pt999. 850 stands for 85% purity.

3, 3D hard gold

3D hard gold or hard gold refers to the improvement of pure gold during the processing (by increasing the gold content, PH value, working temperature, organic brightener content, stirring speed, etc. 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 shortcomings of insufficient hardness of pure gold, so it will be more expensive due to complex processing technology. But if the hard gold ornaments are broken, flawed, cracked and dropped, they can't be repaired. The most fatal point is that hard gold can't be recycled (most actual inquiries don't recycle hard gold)!

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%? K number, you can get the gold content. Platinum, platinum, not gold, added platinum. Its main component is gold, which is white due to the addition of other metals. Platinum is not platinum (platinum). White gold will also use k number to express its gold content.

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.

Extended data:

Cleaning method

1, in order to protect the luster of gold jewelry, you can coat it with a thin layer of nail polish.

2. If there is a black silver film on the surface, 2 grams of salt, 7 grams of baking soda, 8 grams of bleaching powder and 60 ml of water can be used to prepare a "gold cleaner". Put the gold jewelry in a bowl, pour the detergent, take it out after 2 hours, rinse it with clear water (preferably not hard water), bury it in sawdust to dry, and then wipe it with a soft cloth.

3. Ring inlaid with gemstones Roll a piece of cotton with popsicles or matchsticks, soak it in a mixture of toilet water and glycerin, scrub the gemstone and its frame, and then polish the ring with flannel. Never scratch with sharp objects such as blades.

4, salt and vinegar mixed into a cleaning agent, use it to wipe pure gold jewelry, can make it durable.

5. Toothpaste wiping or scrubbing with hot rice soup can also restore luster.

6, available ammonia scrubbing.

Reference: Baidu Encyclopedia: Gold