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First, the type of gold jewelry
1, pure gold jewelry
Pure gold jewelry is golden yellow, bright and soft, soft, hardness 2.5, density 19.32g/cm3 (20 ° C), melting point 1064 ° C, with good ductility, one gram of pure gold can be drawn into 2500 meters long Filament, hammered into 9.6 square feet of gold foil. According to international regulations, all jewellery made of precious metals must be marked on the inside of the jewellery. The mark requires the gold content and the manufacturer. Anyone who has a gold content of 99% and a content of 99.9% is called Qianjinjin. Both Jinjin and Qianjinjin are in the pure gold category.
2, K gold jewelry
K gold refers to the alloy of gold and other metals smelted together, because the English word for the alloy is KaratGold, so it is referred to as K gold. According to the amount of metal added in the jewelry, the gold content in K gold is also different. 24K refers to pure gold. If the pure gold is divided into 24 parts, 1 part is 1K, and the gold content of 1K is 4 .1667%, if it is 18K, the gold content is 18×4.1667%=75%.
(1) Yellow series of K gold jewelry
The yellow series of K gold jewelry (referred to as K yellow) is an alloy of gold and silver and copper. The gold content can be made into K gold series jewelry of different K numbers, mainly 22K, 18K, 14K, 10K and 8K. Asians love high-K-gold jewellery, such as 22K and 18K, Europeans and Americans like 14K gold and 10K gold jewelry. The color of the yellow K gold series jewelry is related to the content of gold in K gold and the ratio of silver to copper . The color of 18K gold is yellower than the gold jewelry of 14K and 10K, and the gold jewelry of the same K number is light if the silver is more yellow than copper. If the copper is more yellow than silver, it is deep.
(2) White series of K gold jewelry
The gold jewelry of the white K gold series (referred to as K white) is white with a slight yellowish yellow color. The imprints are marked with WG imprint. The combination can be divided into the following two types:
The first alloy, which is dominated by gold and combined with silver, nickel and zinc, is called K Platinum in the business world. The 18K K gold is made up of 75% gold and 25% silver, nickel and zinc. 14K K Platinum is an alloy of 58.5% gold and 41.5% silver, nickel and zinc.
The second type is mainly composed of gold and palladium, plus alloys of copper, nickel and zinc. Internationally, the share of each metal in K gold is used as the basis for the title. Currently there are only two varieties, namely 334K white gold is K white gold composed of 3 parts of palladium and 4 parts of copper, nickel and zinc. 226K white gold is 2 parts of gold, 2 parts of palladium and 6 parts of K white gold composed of copper, nickel and zinc.
(3) Red series of K gold jewelry
The red gold K-jewelry is made of gold and copper, with a small amount of silver alloy, and the color is reddish.
(4) Color series of K gold jewelry
The color series of K-gold jewellery is made by pressing K gold of different colors into thin slices, arranging them in different directions according to the color, and forming the sheets together by forging.
3, wrapped gold jewelry
(1) Gold-plated jewelry
Gold-plated jewellery is coated with a layer of gold by electroplating on the surface of the jewellery with copper as the blank tire, but the coating is generally very thin, around 3-5 um.
(2) Gold jewelry
Bao Jin is also known as gold in the United States. Gold-plated jewellery is a layer of gold foil on a copper or silver plate. The thickness of the gold foil is between 10 and 50 um. Since the thickness of the gold-plated jewellery gold foil is thicker than gold plating, the appearance is similar to that of gold jewellery. This kind of gold-plated jewelry has the mark of KF in the United States. If the gold foil is 18K gold, it will be marked with 18KF on the inside of the jewelry.
(3) Sheet metal jewelry
Sheet metal is an ancient gold-plating process. It is uniformly coated with a thick paste of gold and mercury on low-value jewellery such as copper and silver. It is then baked at low temperature and the mercury is evaporated by heat. The surface of the copper is attached and then flattened and polished.
4, imitation gold jewelry
(1) Copper jewelry
Copper jewelry mainly includes: copper jewelry contains 85% copper, zinc 15%; brass jewelry contains 55-85% copper, zinc 15-45%; bronze jewelry contains 80-95% copper, containing 5-20% tin.
(2) Copper-plated jewelry
Copper-plated jewellery is made of copper and is coated with a layer of pure copper. Because the coating spreads evenly and smooth on the surface, the color is beautiful, but its characteristics are exactly the same as copper jewelry.
(3) Rough gold jewelry
Rough gold jewelry is an alloy in which rare earth elements (镧, 铈, é’, é’œ, é“©) are smelted into brass.
(4) Titanium jewelry
Now there is a titanium plating process in which pure titanium flakes are burned in nitrogen gas and acetylene gas. At this time, if an alloy such as copper is placed therein, a golden yellow titanium nitride film may be adhered on the surface, and the film thickness is generally 1 -2 μm.
Second, platinum jewelry
Platinum jewelry has a high density of 21.45 g/cm3, which is twice the density of silver and more than 1.5 times the density of 18K gold. The platinum jewellery currently on the market is a platinum-based platinum-palladium alloy. The platinum content of platinum jewellery is 75-90% in Japan, and 95% in Europe and America. The platinum content in Chinese foot platinum is 90%. %. In order to distinguish it from K Platinum, the platinum stamping requirements are stricter. Platinum chemical symbols PT, platinum content numbers and factory words are required. For example, PT900 plus factory characters are printed in Asia. Please pay attention to check whether there is any imprint when purchasing.
Third, silver jewelry
Silver is a precious metal jewelry that Asians love. It has a density of 11.29g/cm3 and a hardness of 2.7. In order to improve its hardness, it is necessary to add 7.5% copper to silver when making jewelry. 92.5%, alloy containing 7.5% copper, internationally known as standard silver; for the sake of distinction, the singer is usually marked with "S", but there are also no hits.
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