When buying jewelry, it is best to observe the following aspects:
(1) First look at the gems embedded in jewelry. Look at the luster of a gem. Colored gems also sees how bright and even its colors are. Look at the symmetry of cutting and grinding and the brightness of polishing. Natural gemstones have some impurities, so you can look at them under the light, and try to choose what is invisible to the naked eye.
(2) Pay attention to the inlay grade of precious metal brackets when setting precious stones and jewelry. First of all, look at the technological level of precious metal stents. Good quality jewelry will inevitably choose suitable materials and exquisite materials. Fine processing. On the plane, it is smooth and uniform, without gouges and burrs: the pattern combination in jewelry is coordinated, fine and clear, and the pattern is smooth. If it is a ring, it is symmetrical and has a moderate width; The inlaid gems are firm and reliable, with no signs of looseness, smooth feet, moderate size and good symmetry. The teeth of the jewel and the bracket must be closely matched. The ring must be easy to disassemble and the movable ring must be able to open and close smoothly.
(3) Also recognize the types of precious metals selected in jewelry. At present, there are many kinds of precious metals on the market, so it is difficult to distinguish them clearly. Therefore, it is necessary to master some precious metal signs, ask for formal invoices, and ask merchants to indicate the name, color and other detailed information of the purchased goods for after-sales service and rights protection.
Pure gold: refers to the gold content of not less than 990, marked with "Gold", "Gold 990" or "G990".
Thousands of pure gold: refers to the gold content of not less than 999, marked with "Thousands of pure gold", "Gold 999" or "G999".
K gold: Generally speaking, precious metal jewelry with gold content between 8K and 24K [1k = 4. 1666...%] is marked as 24K, 18K, 9K or 750[ that is, gold content is 75%, also called 18K] and. K stands for real gold jewelry; F is the abbreviation of English FLLING, and KF stands for imitation gold; P is the abbreviation of English PLATING, and KP stands for gold plating.
Color gold: it is a mixture of aluminum, silver, cadmium, palladium and other metals. Gold is used to make jewelry appear purple, pink, blue, green and gray. For example, we usually see 18K platinum, which is often considered as a kind of platinum. In fact, 18K platinum contains 75% gold and 65438+ silver.
Other substances in platinum jewelry are mainly its kindred element Pd [Pb]. For example, PT900 represents 90% PT and 10% Pd, and so on. The platinum content in platinum ornaments is generally not less than 85%. In addition, there is palladium gold on the market, and pd950 (palladium) means that the palladium content is 95% and the palladium content is 99%. The fineness of silver ornaments is also expressed by the silver content of one thousandth: full silver, with a silver content of not less than 990, marked with "full silver" or with an actual silver content of 925, with a silver content of not less than 925, marked with "Silver 925" or "S925" and plated with gold. It uses the principle of electrolysis to plate a very thin layer of gold on the surface of jewelry made of silver or copper.
Gold plating: gold foil is coated on the surface of metal materials such as silver and copper, and the fineness of gold foil is required to be not less than 10K and the weight is not less than 1/20 of the total weight of the material. KF is often used to mean forging gold: it is essentially gold plating, and it is forging gold foil on the surface of other metal jewelry blanks at high temperature and high pressure. The fineness of gold foil shall be greater than 10K, in which the total amount of forged gold shall not be less than 5% of the finished product, and marked with "GF" or "KGF". Forged gold has strong surface hardness and high wear resistance, and it is not easy to lose the gold texture.