The second type: trade-in. This is most of the choices. Its advantages are obvious, simple and quick, and it avoids the trouble of selling old gold jewelry to buy new jewelry. One store can do it. Disadvantages: You have to buy old jewelry.
Extended data:
Gold jewelry refers to jewelry made of gold as the main raw material. The chemical symbol of gold is Au, with a specific gravity of 17.4 and a Mohs hardness of 2.5. Gold ornaments can be divided into pure gold and k gold according to their gold content.
The gold content of pure gold jewelry is above 99%, and the highest can reach 99.99%, so it is also called "99 gold", "all gold" and "red gold". In order to overcome the shortcomings of gold, such as high price, low hardness, single color, easy wear and delicate pattern, some other metal elements are usually added to pure gold to increase the hardness of jewelry gold, change its color tone and lower its melting point, so that gold alloy jewelry with different colors and obviously different gold contents appears, and is marked with the word "Kai". K-gold system is an internationally accepted standard of gold measurement. The complete characterization of K-gold is "K-gold", which gives K-gold an accurate gold content standard, thus forming K-gold jewelry series.
Among gold jewelry, pure gold jewelry is soft in texture, with teeth marks, easy to bend, golden in color, pure and soft, and heavy in touch. K gold jewelry is slightly hard and toothless, and its color is yellow with white. With the decrease of K number, the white gradually increases and the yellow gradually becomes lighter. K gold jewelry is not as heavy as pure gold jewelry. In addition, pure gold and K gold jewelry are stamped.
The seal on gold jewelry can be represented by the word "gold" or the English letter "Kg". When indicating the gold content, the words "99" or "24K" indicate pure gold jewelry, and K gold jewelry indicates the corresponding K number according to the different gold content. For example, K gold jewelry marked "18K" has a gold content of 75%. In addition, there are seals on the jewelry, indicating the origin of different manufacturers. Real gold jewelry, with standard, complete and clear seal, is an important identification mark.
There are many kinds of jewelry that are easily confused with gold jewelry, including gold-plated jewelry, gold-plated jewelry, copper jewelry, copper alloy jewelry and so on.
There are many ways to identify gold ornaments, and China folks have summarized a set of simple methods. The formula is: look at the color, weigh, listen to the rhyme, fold hard, grind on the stone, compare the cards, point with acid and fix the color. The first four sentences rely on perception and feeling; The last four sentences need tools and reagents.