Gold jewelry: The discoloration or fading of gold jewelry is closely related to human sweating. 99% of human sweat is water, and about 1% is wastes and harmful substances in human body, such as chlorinated substances, lactic acid, urea ammonia, etc. When these substances come into contact with silver and copper in gold jewelry, they will react chemically to produce silver chloride and copper sulfide, and present dark black chemical salts. This chemical salt often falls from gold jewelry, polluting the wearer's skin and leaving very obvious black spots on the skin. At present, cosmetics have also become one of the indispensable "roles" in people's lives. If it is applied to the skin of the wearing part of gold jewelry, it will undoubtedly provide an opportunity for cosmetics containing chemical substances and gold jewelry that is most afraid of chemical erosion, and the result can be imagined. Some cosmetics also contain some fine hard particles, which can constitute another kind of dirt, thus wearing away gold jewelry. Regional environmental factors may also make gold jewelry lose its bright color. For example, in dry areas, the air contains a lot of primary fine dust, which will form a kind of "human sandpaper" after being polluted by human body, which can grind gold jewelry into extremely fine debris and appear local black stains. It is worth mentioning that talcum powder or moisturizer also contains similar particles, which will also overshadow the above-mentioned gold jewelry. Treatment: Brush with soapy water mixed with a little alcohol, rinse and dry.

Platinum jewelry: I have been longing for it for a long time. When an elegant and beautiful platinum jewelry brings you a good feeling, can you think of how to take good care of your beloved platinum jewelry and make it shine as good as new with you? Here are some simple ways to teach you. When doing housework, don't let the platinum jewelry you wear be contaminated with oil or bleach, oil will affect the luster of the jewelry; Bleaching water will cause spots on jewelry. Although you want to attract attention when you are young, you must not wear platinum jewelry and gold jewelry at the same time, because gold is soft. If they rub against each other, the gold powder will be adsorbed on platinum, which will turn platinum yellow and affect its unique pure luster. If you wear it frequently, you should try to clean it once a month to keep it shiny. You can clean it with a special jewelry cleaner or you can clean it yourself. The correct way is: squeeze the toothpaste on the towel, rub it back and forth with platinum jewelry to remove fine lines and dirt on the surface, then wash it with diluted household detergent, and then rinse it with clear water, and the luster can be restored as new. If your platinum jewelry is inlaid with diamonds, I suggest you send it to the jewelry store for inspection every year, and carry out professional cleaning and renovation in time, so that platinum diamond jewelry can always be worn new. Just like beautiful flowers and plants need careful care, your platinum jewelry needs your care to spend a good time with you.

Pearl jewelry: Although the color of pearl is beautiful, it can't stand the test for a long time. Generally, after several decades, pearls will turn ordinary yellow and lose their beautiful luster. This is what the old saying goes, "people are old and yellow." Why do pearl ornaments turn yellow after long use? This is mainly because the physical properties of aragonite minerals that make up pearls are unstable. Over time, it will become ordinary calcite. Aragonite and calcite have the same chemical composition, but their crystal morphology and luster are different. This is the reason why pearls change color. There are some remedies after the pearl turns yellow, that is, soaking in dilute hydrochloric acid can dissolve the yellowed shell and make the pearl reappear its glittering and charming color. But if the color becomes serious, it is irreversible. Wear pearl jewelry after makeup, because any beauty products (powder cake, foundation cream, etc. ) is harmful to pearls, including perfume and hair gel. The pearls worn should be soaked in clear water, washed, dried and then stored, otherwise the pearls will turn yellow easily.

Diamond jewelry: add water and washing powder to the container, boil your diamond ring in water for 10 minute to soften the dirt on it, then brush it with toothbrush, rinse it with clear water, then wash it with 90% alcohol, and finally take it out to dry.

In addition to the above general principles, because different gems have different qualities, there are some special requirements and precautions in the maintenance of some jewels. They are introduced as follows:

(1) Gem jewelry such as diamonds, rubies, sapphires, tourmalines and topaz. These gems are hard and can withstand great pressure, but they also have the same shortcomings-they are brittle and cleavage for diamonds and topaz, so these gems can't stand knocking and knocking, otherwise they will collapse due to brittleness, or crack or even break along the cleavage direction due to cleavage. Remember, no matter how hard a diamond is, it can't stand the impact.

(2) Jade jewelry. Although jadeite is hard and tough, it has certain impact resistance. However, the processed jadeite products are often thin and will be damaged by impact.

(3) Emerald jewelry. Emerald is slightly harder than jade, but it is more brittle than jade, and it can't withstand impact and beating more than jade. In addition, emeralds are afraid of high temperature, which will make their colors fade in case of fire and easily burst at high temperature.

(4) Amethyst jewelry. The color of amethyst is unstable and will fade when exposed to high temperature or for a long time. Avoid high temperature or exposure during wearing or storage.

(5) pearls and coral jewelry. The hardness of pearls and corals is very low, and the surface is easy to lose luster due to friction. Both components are calcium carbonate, which will be corroded and dissolved in acid. It is easy to sweat in summer, and sweating will also damage the surfaces of pearls and corals and lose their original luster. Powder, perfume and hair cream in cosmetics will also make pearls fade gradually. So it is best not to wear this kind of jewelry in summer. If you get dirty by sweat stains, you can rinse it with clear water and then gently dry it with a soft fabric. Pearl ornaments must be washed with clear water before collection, and the storage place must also avoid cosmetics.