Many people can't tell the difference between pure gold, K gold, gold, and gold-plated jewellery. Today, I will give you some tips for distinguishing and identifying. Let's take a look!
Pure gold jewelry
Pure gold jewelry is golden yellow, bright and soft, soft, hardness 2.5, density 19.32g / cm3, melting point 1064 degrees Celsius has good ductility, one gram of pure gold can be drawn into 2500 meters long filament. Hammered into 9.6 square meters of gold foil, which shows the good ductility of gold. As far as the current national standards are concerned, if the purity of gold exceeds 990, it can be called pure gold. How to identify pure gold?
Tips:
The Chinese folks have summed up a set of simple methods, which are: look at color, weight, tone, hardness, stone grinding, contrast cards, acid points, and color.
1, imprint
All precious metal jewellery according to international regulations must be marked on the inside of the jewellery. The mark requires the mark content and the manufacturer to be marked. Any gold content greater than 990 can be called full gold.
2, the amount
The density of gold is 19.32g/cm3, which is more than twice the density of copper. The gold in hand has the feeling of falling hands and the handcuffs are heavy but not heavy.
3, listening
Free fall of gold jewelry on the concrete floor will make you squeak, and its imitation is the crisp sound of the cockroach. In addition, the pure gold jewellery has a small elasticity, and it will not bounce off when it falls to the ground, and its imitation Most of them will bounce a few times because of the good elasticity.
4, hardness
The hardness of the gold jewelry is 2.5 and the hardness of the human nail is equivalent, so the nail can be used to draw fine marks.
K gold jewelry
K gold is a metal mixed with a certain amount of gold and other metals. The synthesized K gold can display a variety of colors such as gold, rose, purple, white, etc. The variety of colors makes K gold occupy the gold jewelry market. point. K gold is calculated by dividing pure gold into 24 parts. 24k gold is 100% pure gold. It is divided into 22K, 18K, 14K, 9K according to the amount of gold. Currently, it is most popular with 18K gold. It is divided into white 18K. Gold, red 18K gold, rose gold, color 18K gold.
Tips:
1, K gold jewelry hardness is above 3.5, the surface is tough, smooth, with a copper needle scratched;
2, K gold jewelry has low toughness, high brightness, is not easy to deform, and is not easy to wear;
3, K gold is more bright and lustrous than pure gold jewelry, with sharp edges and corners, generous shape and strong internal light.
Wrapped gold jewelry
The composition of the metal in any part of pure gold jewelry and K gold jewelry is the same, while the gold jewelry in the package is two or more kinds of metal attached or forged together, wrapped in each other, and the metal composition is different in different parts. Its surface is gold, while the interior is copper and silver.
Gold-plated jewelry
Gold-plated jewellery is made of copper on the surface of the jewellery. It is plated with a layer of gold by electroplating, but the coating is generally very thin, around 3 to 5 weeks. This gold-plated jewellery is bright and soft, but not durable, just as easy to wear as a gold-plated strap, revealing a brass tire with a dim yellow color. This kind of gold-plated jewellery is easier to identify. Look carefully at the joints of the jewellery or the corners of the corners. There will be no gold plating. In addition, its density is small, the hand hoe is light, no falling hand, falling on the ground. There is a crisp "when" sound, the elasticity will be good; there is no imprint, and sometimes the GP logo is printed.
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 m. Since the thickness of the gold-plated jewellery is thicker than gold plating, the appearance is similar to that of gold jewelry. This kind of gold-plated jewelry has the mark of KF in the United States. If the gold foil is ISK gold, it will be marked with 18KF on the inside of the jewelry.
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. After the mercury is heated, it evaporates. Then attach the surface of the copper, then flatten and polish it. Currently, this method is rarely used. Because the surface of the wrapped gold jewelry has a very thin layer of gold, it is deceptive, but it still retains the characteristics of copper products. For example, the density is small with a handkerchief, and it is continuously beaten after falling to the ground. Generally, there is no imprint.