Where to check whether it is pure silver in Guangzhou?

Silver ornaments can be divided into pure silver, broken silver and colored silver according to their fineness. According to the processing method, it can be divided into silver casting, silver making and silver fine products. The identification of silver ornaments can also adopt the methods of looking at the color, testing the hardness and elasticity, weighing, listening to the melody, testing the reagents and so on. The fineness of silver jewelry is above 97%, the skin is white and delicate, and the luster is soft and pleasing to the eye; The skin color of the weak is bluish white or gray, sometimes it is yellow, black and other variegated colors, and the color is dull.

Silver jewelry itself has strong plasticity and changeable shape, and it is no longer the pure silver jewelry in our impression. It has many fashion elements in shape, variety and technology, and the sales of silver jewelry are also rising year by year.

Besides sterling silver jewelry, there are black silver jewelry, Tibetan silver jewelry and colored silver jewelry. The attraction of silver jewelry is that it can be inlaid with gems or imitation gems and other materials, which is more diverse.

Although the raw material of silver is very cheap, some manufacturers will mix cheaper metals such as cadmium, iron and copper into silver ornaments. Cadmium is harmful to human body and is not allowed to be mixed in jewelry according to regulations. Manufacturers do this mainly to reduce costs and obtain higher profits. Copper wires are mainly mixed in silver locks to make intermediate support frames. According to national regulations, the support frame in the silver lock should also be silver. Because the copper wire is hidden in the silver lock, consumers can't see it at all. Jewelry can only be destroyed after inspection, and its true colors can be seen. Only after a long time, the copper rust inside oozes out, and consumers can find it.

Although silver jewelry is not expensive, it is difficult to distinguish between true and false. Although this phenomenon is not common, consumers should master some methods to identify silver jewelry. Consumers can check the physical properties of silver when buying. Commonly used inspection methods are:

Look at the color of jewelry: the higher the purity, the whiter the silver, and the surface of jewelry looks even, shiny and polished. If it contains lead, the jewelry will appear bluish gray; If it contains copper, the surface of jewelry will be rough and the color will not be moist.

Jewelry weight: the density of silver is slightly higher than that of ordinary metal. Generally speaking, "aluminum is light, silver is heavy, and copper is not light or heavy." Therefore, it can be preliminarily judged whether it is silver by weighing. If the jewelry is large and light, it can be preliminarily judged that the jewelry belongs to other metals.

Hardness inspection: the hardness of silver is lower than that of copper, but higher than that of lead and tin. It can be detected by marking the jewelry in an inconspicuous place with a pin. If the needle slips, it is difficult to leave traces on the surface, which can be judged as copper jewelry; If it is made of lead and tin, the trace is obvious; If the object has traces but is not obvious, it can be preliminarily judged as silver jewelry.

Listen to the rhyme: hitting the floor, a piece of sterling silver jewelry, no elasticity, the voice is "boo boo boo". The lower the color, the lower the sound, and the sharper and higher the rhyming sound; If it is made of copper, its sound is high and sharp, and its rhyme is short and short; If it is made of lead and tin, the sound of falling to the ground is dull, short and inelastic.

It is not an ideal method to test silver ornaments only by their physical properties and experience. Only by destroying the silver ornaments can the authenticity of the silver ornaments be tested by chemical methods. However, this is beyond the power of consumers. When buying silver jewelry, consumers should not only master some basic inspection knowledge, but also pay attention to whether silver jewelry has relevant certificates, certificates and certificates. Only silver jewelry that has been tested by testing institutions can be purchased with confidence. In addition, the silver content of silver jewelry must be accurately marked, and consumers should check whether there is the word "925" on the jewelry when buying. "925" is a symbol of pure silver. As long as you have "925", you can guarantee that you are buying genuine sterling silver jewelry. Pay special attention to whether its fasteners can be fastened and secure when purchasing. When buying silver chain jewelry, put it flat and see if the links are kinked or bent. The price of silver jewelry is determined according to the content of precious metals, structural design and technology, so the most important criterion for choosing silver jewelry is whether you like it or not.

Appraisal of 925 pieces of silver ornaments

Yin Xiaoshi

About 925 sterling silver

Silver is an indispensable combination metal in K-gold jewelry, but as a jewelry dominated by silver, it is mainly a kind of "standard silver" with high purity.

The hardness of silver is 2.7. In order to improve its hardness and obtain the best molding effect, it is necessary to add 7.5% copper to silver when making jewelry. This alloy containing 92.5% silver and 7.5% copper is called standard silver internationally. Also known as the pound in Britain. In addition, there are enough silver ornaments with a silver content of 99% on the market.

925 silver is the international standard silver for making silver ornaments. It is different from 9.999 silver, because 9.999 silver has a high purity and is very soft, so it is difficult to make complicated and diverse ornaments, while 925 silver can. In fact, the silver content of 925 silver jewelry is not 100%, because 7.5% alloy is added to pure silver, which improves the luster, brightness and hardness of silver. Only with our colorful silver ornaments today.

Identification of silver

1) stamp. Silver ornaments are generally stamped with the English abbreviation of silver ("S" or "Sterling"). The mark of standard silver is S925. The imprint of foot silver is S990. But there are also many countries that don't print paper money on silver ornaments.

2) color. Silver ornaments are mostly yellowish silvery white with a soft metallic luster. Due to easy oxidation, the color will turn dark yellow and white after a long time.

3) weigh it. The density of silver is10.53g/cm3. Smaller than platinum and gold, it won't fall off by hand. Steel needles can be marked or bent. In this way, it can be distinguished from platinum jewelry, K gold jewelry or imitation silver jewelry.

4) Acidity test. Silver will change color or even dissolve when it meets any acid. If a drop of concentrated hydrochloric acid is dropped on the inside of silver jewelry, white moss-like silver chloride precipitate will be formed immediately. Other precious metals do not have this phenomenon.

5) Phonology. After the standard silver jewelry falls to the ground, it sounds dull, does not rebound and does not roll.

Maintenance of silver ornaments

The blackening of silver ornaments is a normal natural phenomenon. Because sulfur and oxides in natural media such as air have a certain corrosive effect on silver, after wearing for a period of time, some tiny spots (silver sulfide film) will appear, which will spread into pieces or even turn black over time. Even if a protective film is electroplated on the surface of jewelry, it will still be oxidized if it is not paid attention for a long time. Therefore, some silver ornaments are discolored by oxidation at present. However, if you pay attention to the following points, you can extend the bright period of your precious jewelry.

① Don't wear precious metal jewelry when wearing silver jewelry to avoid collision, deformation or wear.

I hope I can help you.