What are the classifications of gold? Which is the most expensive?

Gold can generally be divided into red gold, color gold, mixed color gold and K gold. Among them, pure gold is generally the most expensive because of its high purity
first, the meaning of "red gold" and "pure gold" is similar, but the standard of "red gold" is different due to different time and place. The gold sold in the international market is called "red gold" with a fineness of 99.6%. And the red gold in the territory is generally between 99.2% and 99.6%
Second, colored gold, also known as "secondary gold" and "tidal gold", refers to gold with low fineness. Due to the different content of other metals, the fineness of these gold is as high as 99% and as low as 30%
III. mixed color gold refers to gold containing copper, zinc, lead, iron and other metals in addition to silver. It can be divided into small mixed gold, large mixed gold, bronze mixed gold and lead mixed gold according to the types and quantities of the metals contained
IV. K gold refers to the gold prepared by a certain proportion of silver and copper according to the formula of 24K full gold. Generally speaking, the more the proportion of K gold and silver, the more green the color; If the copper content is large, the color is purple red
according to the different classification of other metals, mature gold can be divided into clear color gold, mixed color gold, K gold, etc. Clear color gold refers to the gold with only silver component, regardless of its fineness. There is more clear color gold, which is commonly used in gold bars, gold ingots, gold nuggets, various utensils and gold ornaments.

I talked about the engraving of gold jewelry before. A friend told me that there were so many ways in it. When you know what the engraving represents, you can make your own judgment. You don't need to listen to the waiters of the gold shop. However, some new terms are still unclear, such as sand gold and hard gold... Today I will choose the classification of gold to briefly talk about it.
according to the classification of Chinese traditional customs, the types of gold are generally divided into the following two categories: Five sub categories
gold can be divided into raw gold and cooked Gold: this should be easy to understand. Naturally mined gold without smelting and processing is raw gold, and vice versa
gold can be divided into placer gold and rock gold
1. Placer gold: it is produced in the alluvial geological belt, and the gold bearing ore exposed to the surface. After being eroded by wind and rain and washed by flood, the gold bearing rock debris and soil sand flow along the water. Because of the large proportion of gold, it is deposited under the soil sand. After several years, the gold bearing layer is formed at the bottom of the river or under the gravel, that is, the placer gold deposit. After mining and panning, the placer gold is obtained
Natural placer gold particles have different sizes, some of which are shaped like melon seeds, and weigh as much as four or five coins or even three or five coins. Therefore, it is also called "melon seed gold", with a fineness of about 85-88%. There is also a large-scale gold nugget, known as "dog head gold". Dog head gold often appears in the sand layer or soil layer on or near the surface. Because of its shallow burial, it can often be dug out of the soil, and occasionally found in river valleys or wilderness
too fine placer gold is difficult to collect because of its small size, like Earth sand. The folk generally use the mercury mixing method to collect gold: that is, mercury is put into the gold panning basin containing gold bearing black sand and mixed with mercury. Because gold has the characteristic of adsorbing mercury, mercury naturally adsorbs and mixes fine gold particles into mercury paste. The mercury paste is wrapped with fine cloth, and most of the mercury is extruded. The soft solid mixed with gold and mercury is left in the cloth, which is baked with charcoal fire, and the remaining Mercury turns into gas volatilization and becomes gold dust
2, rock gold: primary gold. The deposit types are polymetallic sulfide ore and gold bearing quartz vein; Pyrite gold bearing quartz vein; Gold deposits in pyrite bearing fine crystalline rocks and granites; Gold deposits contained in silicalite. The above are all rock gold deposits. The gold ore is often mixed with quartz. The thickness of the ore layer is different, some are tens of meters, and some are only a few centimeters. Gold mining; After beneficiation, the pure gold is extracted, and some of them are preliminarily extracted by cyanidation and mercury mixing
raw gold becomes mature gold after smelting. All kinds of ripe gold can be divided into high-color gold, red gold, color gold, etc., but they are not pure gold. As the saying goes, "there is no shortage of gold", that is, 100% pure gold does not exist. Even if it is purified by electrolysis, its purity can only reach 99.999%. According to the No. 1 amendment to the regulations on the purity and nomenclature of precious metals in jewelry published by the National Standardization Administration last year, since May 4, 2016, "gold, platinum, palladium and silver" will become the highest purity title of jewelry products, and the current title of "thousands of gold" will no longer be used
among them, mature gold can be divided into clear color gold, mixed color gold and K gold according to different metals
(I) clear gold
Gold contains only silver, and is called clear gold regardless of its fineness. Features: soft texture, different colors with silver content. The color of which is about 95% is red yellow; About 80% of them are positive yellow; About 70% of them are cyan yellow. That is, the so-called "seven green, eight yellow and nine five red". Color: 50% of the color is yellow, white and slightly gray. Clear color gold commonly includes bars, ingots, leaf gold and jewelry gold. When you choose jewelry, you can judge the color according to the color, but the premise is that you can distinguish it at a glance after seeing a lot of experienced jewelry
(II) mixed color gold is called mixed color gold, which contains copper or other metals in addition to silver. Most of them contain silver and copper, and less lead and other metals. Mixed color gold can be divided into small mixed gold and large mixed gold according to different metal compositions
1. Small mixed gold: gold containing silver and a small amount of red copper is called small mixed gold. The characteristics of small mixed gold are: the color is slightly red than the clear gold, and the constitution is slightly hard. There are small spots on the surface of gold bars and ingots, which are not smooth and smooth, and the beating has a long rhyme
2. Large mixed gold: large mixed gold contains more copper than small mixed gold, or contains other metals
(III) K-gold
K-gold is an internationally used alloy metal. K is the abbreviation of karat in English, usually called "K gold" or "Kaijin". It is mainly used to produce jewelry and commemorative gold coins. It is characterized by bright color, hard and wear-resistant. The common K-gold products include inlaid rings, watch cases, necklaces, earrings, gold coins, pen tips, etc. Generally, the highest purity is 24K (the gold content is 99.69%). In addition to gold, the rest of the K-gold is silver and copper. The general ratio is silver, copper and eight. There are also silver, copper and seven, or it is completely mixed with copper. K gold jewelry is often engraved with the number of K. to calculate its gold content, you can multiply the number of K by 4.16866%
in particular, as I said in my previous post on gold engraving, there are some non-k gold ornaments in the market with the word K, such as KP, KF and other words, that is, gold plating and gold wrapping. This can only be regarded as handicrafts and should not be regarded as K gold ornaments. Before, a man took a necklace with KF engraved on it and asked me if it was worth buying in XXX store. It's OK for the shop to sell you handicrafts at the price, but if you sell them as gold, you should be careful not to be fooled
what I mentioned above is the traditional classification of gold, and I will also talk about the new 3D hard gold and sand gold.
let's start with 3D hard gold. Its gold content is 99.9%, which is consistent with the 999 purity of ordinary gold (don't worry about the purity). It is actually an improvement of the gold electroforming process. It can improve the hardness of gold by adding a small amount of other metals for electroplating, It solves the design limitations of gold due to its soft characteristics, and significantly improves the fineness of the appearance of jewelry. The advantages are hollow, thin, high hardness, and not easy to deform and damage. Even if it is handled with ordinary force, it will not sag. Although hard gold has the advantage of being 4 times harder than ordinary gold, and the hardness is close to 18K, the product itself is thin, and the thickness of each product is only 0.2-0.3mm, which is hard but brittle. For example, it is almost impossible to repair the breakage of the product itself and the problems in the rotten hole during wearing. Therefore, avoid collision with sharp hard objects during wearing, and do not manually test the hardness and abrasiveness of the product itself
also, it is expensive (mainly including the cost of Technology). Although I have not bought it, I can know the price by listening to the customer's complaints (why do customers complain, because the price of our pawn gold and hard gold is the same, the same, the same...)
well, let's talk about the gold, what is the "gold"? I said that I didn't know there was "sand gold" before. I only knew "sand gold" (the original raw gold mentioned at the beginning) and "velvet sand gold" (a kind of gold plating handicraft)
gold jewelry is either full gold, or how many karat gold. There is no jewelry made of sand gold at all. That is a concept of stealing. Jewelry sold in the name of sand gold is fake. At present, there is no word "sand gold" in shopping malls or national standards, because according to the current national regulations on gold jewelry, sand gold does not belong to precious metal jewelry. Therefore, it can be concluded that the headpieces sold in the market that call themselves "sand gold", "Vietnam sand gold" and "Yunnan sand gold" are all fake jewelry. The merchants claim that "never fade gold" is probably copper-plated jewelry or other, but it can never be gold. Because there is no concept of gold jewelry now, once the merchants sell jewelry related to "gold", they can be judged as fake jewelry. As for jewelry other than precious metal jewelry, I still say that you have no problem selling handicrafts, but please don't cheat
well, that's it. Leave me a message if you want to know something