Friends from all over the world often ask about platinum, K gold, PT and AU, and even some unheard-of symbols mark the differences between them. To tell you the truth, I guess I heard it from the salesgirl in the gold shop. The consumption level of jewelry markets varies greatly from place to place. It is very complicated to explain one by one, and netizens can't remember so much. Of course, those who are interested can visit relevant professional websites to study them carefully. Here are three simple and principled formulas for everyone:

1. Just like gold marked with 9999, only platinum marked with PT950 is counted!

2. All those marked with 750 are 18K(24 divided by 18 equals 75%), regardless of the previous symbols!

3. 18K platinum has no platinum!

For non-platinum metals, we can all call them K platinum, platinum, K gold and so on, or simple alloys (synthetic metals). Anyone who wants to confuse this intermediate concept, hehe, is a profiteer!

If you buy real platinum, the column of the support of the appraisal certificate will be marked with PT950, just like 9999 gold. If not, or use an asterisk instead, what do you say? I don't know!

Why is this happening? The reason is very simple, because only PT950 has international standards and national standards, which means it is universally applicable, and jewelers dare not expect it. Where are the others? How many other metals did I mix? What's your name? I didn't mark PT950! We can imagine that a processing factory imported a batch of PT950 platinum, 9999 gold and other metals from the exchange. Its products are: PT950, PT900, AU750, H750, B750, etc. Let's take America as an example. You will find that there are only three kinds of jewelry supports recognized by Americans: 9999 gold, PT950 platinum and 18K gold (yellow and white). Capitalism is the norm!

Friends in Beijing and Shanghai, I have to sigh for you: there are too many so-called "PT900 Platinum" in your place! ! I don't want to mention anything about 750! )

Of course, from the perspective of spending power, you can buy any kind of jewelry. But there are two points to consider: first, the bracket with nonstandard color may encounter difficulties in after-sales service, and it is difficult to find a matching color; Second, from the perspective of value preservation, the standard color is easy to cash.

In fact, the real 18K is not cheap. The key is to find out the ingredients added in it. What is real 18K gold? Because platinum is scarce, expensive and has a high melting point, it is rarely used to produce true K platinum in general countries. After the outbreak of World War II, due to the important military use of platinum, the US government once banned the non-military use of platinum, and replaced platinum with platinum (an alloy of gold and other white metals), although platinum can never replace platinum in many aspects such as luster and hardness. At present, in order to meet the demand of consumers for platinum, gold, palladium or nickel, silver, copper, zinc and other metals are selected to be smelted into a white alloy, which is called "K platinum". The fineness of K platinum is the same as that of K gold, the bundle mass is 24, and the share of gold in it is the K number of K platinum. In fact, it is not difficult to accurately detect the remaining 25% color of each piece of K gold jewelry, but it is meaningless. From a symbolic point of view, it is not recommended to buy K gold jewelry for important purposes such as marriage.

Male friends are often the first to contact such goods, and female friends often don't think deeply. So, if you have time, you'd better study it before buying it!

The imprint of platinum jewelry:

Material and content stamp: such as Pt900, indicating that the platinum content is not less than 900‰ (that is, 900 ‰).

Manufacturer's seal: such as Beijing E, indicating that it is produced by a manufacturer in Beijing.

Diamond weight: for example, D0.26 means that the inlaid diamond weighs 0.26 carats.

Consumers should pay special attention to the imprint when buying jewelry, and distinguish platinum (platinum) jewelry from platinum jewelry. White 18K gold printing is G 18K, and platinum (platinum) is Pt.

In order to meet the needs of consumers, merchants have also developed and produced "lottery gold" in various colors. Got the bonus.

Gold is mixed with various other metals such as aluminum, silver, cadmium and palladium. , make jewelry appear purple, pink, blue,

Green, gray and other colors. Lottery money is k gold. As we usually see 18K platinum, people often think it is platinum.

One, in fact, 18K platinum is platinum with 75% gold, 10% silver, 10% zinc and 5% nickel, which are also found in Hong Kong and Macao.

It is called "Dacheng K Platinum", or "33 kilos". Because its appearance is similar to platinum jewelry, people often confuse it as long as it is young.

It is not difficult to distinguish the two by careful observation of the marks.

Foot platinum: the platinum content is not less than 990, and it is marked with "Foot Platinum" or "PT990".

950 Platinum: The platinum content is not less than 950, and it is marked with "Platinum 950" or "PT950".

900 Platinum: The platinum content is not less than 900, and it is marked with "Platinum 900" or "PT900".

850 Platinum: The platinum content is not less than 850, and it is marked with Platinum 850 or "PT850".

Other substances in platinum jewelry are mainly its kindred element palladium (Pb), such as PT900, which means that it contains 90% platinum.

Containing 10% palladium, and so on. The platinum content in platinum ornaments is generally not less than 85%.

The fineness of silver ornaments is also expressed by one thousandth of the silver content.

Foot silver: the silver content is not less than 990, so it is marked with "foot silver" or according to the actual content.

925 Silver: The silver content is not less than 925, so mark "Silver 925" or "S925".

Gold plating: Using the principle of electrolysis, a very thin layer of gold is plated on the surface of jewelry made of silver or copper. This method is very popular in China.

The industry standard gold plating layer thickness is not less than 0.5 μ m, even if it is thin gold plating, it must be greater than 0.05 μm m. Symbol of gold-plated jewelry

Is it "GP" or "KP"

Gold plating: gold foil is coated on the surface of silver, copper and other metal materials, and the fineness of gold foil should not be less than 10K, and the weight should not be low.

In the total material weight of 1/20, it is often expressed by KF.

Forging gold: it is essentially a gold-clad foil, which is forged on other metal jewelry at high temperature and high pressure.

On the surface of the blank. The fineness of gold foil should be greater than 10K, and the total amount of counterfeit gold should not be less than 5% of the finished product.

Forged gold marked with "GF" or "KGF" has strong surface hardness and high wear resistance, and it is not easy to lose the golden texture.

750 means 18K gold (with a gold content of 75%), and Italy means made in Italy.

L may be the abbreviation of "long", which means that yours is a longer style.

I guess it's according to the specification of earphone product parameter labeling, hehe ~ ~