According to the national product standards, jewelry products should have the color symbol "pure gold" and the manufacturer's logo. 1. Be sure to go to a large-scale, well-managed professional gold shop to see if all its accessories have been tested one by one by the national legal quality inspection institutions and can issue certificates. What professional testing equipment are there, whether there are professionals, how to ensure after-sales service, and whether it is convenient and feasible. 2. Look at the label: the label is to express the quality of jewelry to customers according to national standards. It shall be uniformly signed and printed by the computer (due to easy alteration of handwriting or clerical error), indicating the name of precious metals or the name, color, type, weight (or price) and address of jewels and jade, and whether they have been tested one by one by the national legal quality inspection institutions. That is, whether there is a national legal quality inspection agency to participate in quality control, and whether the national quality inspection agency directly marks or pastes anti-counterfeiting marks on the labels. 3. According to your own conditions and personality, you must try it on the spot, match it on the spot, and compound it on the electronic scale on the spot. 4. Check the color code and manufacturer's logo on jewelry products, and don't buy products without logo. 5. Check whether the necklace buckle is naturally matched and whether the safety buckle of the bracelet is moderately elastic. The choice of ring should be based on the moderate tightness, and the setting of precious stones and diamonds depends on whether it is loose. How to buy gold jewelry 1 Seal: According to the national product standard, jewelry products should have the color code of "pure gold" and the seal of the manufacturer. 2. Color: Pure gold is bright golden yellow, while the luster of copper is harsh. 3. Weight: The density of gold is more than twice that of copper. The same volume of gold and copper, gold has obvious drop feel. 4. Hardness: there will be tiny marks when you scratch on pure gold with your nails, but you can't scratch on copper. How to buy platinum jewelry series 1? Stamp: According to national product standards, platinum jewelry should have platinum chemical element symbol Pt, platinum content (Pt950, Pt990) and manufacturer's stamp. 2. Color: The color of platinum jewelry is silvery white with gray tones, bright and never discolors, while silver is mostly yellow-white, white 18K gold is not as bright as platinum, and white is bluish yellow. 3. Weight: The density of platinum is more than twice that of silver, and platinum, silver and platinum with the same volume have obvious falling feeling. 4. Hardness: Because platinum is harder than copper, it can't be scratched with copper wire, while silver is scratched with copper needle. How to buy K gold jewelry series 1? K gold is divided into yellow gold, red gold, white gold and colored gold, which are very popular in China market. 2.k gold is divided into 22K, 18K, 14K, etc. According to its content, it must be marked by the manufacturer and carefully identified. 3. The imprint of K gold is: G 18K or Au750 or Gold 750. How to buy inlaid jewelry 1 Check whether the gems on the inlaid jewelry are loose. 2. There must be an appraisal certificate issued by a national statutory testing institution. 3. Observe with the help of relevant detection tools, such as magnifying glass and diamond pen. , or see if there are professionals who have obtained qualification certificates issued by the state or graduates majoring in jewelry for on-site guidance. By trying on and comparing, you will have more buying experience. Maintenance of diamond ornaments 1. Diamonds are the hardest natural substance in the world. If they are put together, they are easy to scratch when rubbing against each other, so they should be stored separately in boxes or transparent plastic bags. Other precious stones and jade articles should be collected in the same way. 2. If you want to clean the diamond jewelry yourself, you can soak the diamond jewelry in diluted soap solution, gently wipe the diamond and its holder with a soft brush, then rinse it with clear water, and then absorb the water with a soft cloth. At the same time, don't forget to wash the washbasin in advance or block it to prevent diamonds from falling into the canal. 3. After each self-cleaning, check whether the diamond is loose (the jewelry that is often worn should be checked once a month before being repaired). If shaking is found, you can contact Hairong Jindian to fix the turquoise firmly. 4. Don't wear jewelry when exercising or doing heavy work to avoid collision or wear (including washing clothes and bathing). In order to keep your diamond ornaments in the best condition, we suggest that you have professional care once every six months. Maintenance of pearl ornaments 1. Pearl surface lacks hardness, so it needs to be carefully stored, and it should not be scratched by knives or hard objects. 2. Pearl is an organic substance, and its main component is calcium carbonate. Therefore, avoid contact with cosmetics, perfumes and any chemical substances, such as vinegar, orange juice, bleach, sulfuric acid, correction fluid, etc., so as to avoid damage to the pearl surface and loss of luster. 3. After wearing pearls, gently wipe the pearl surface with a soft wet towel to clean substances such as sweat or cosmetics. 4. Don't soak and wash pearl ornaments in hot water, which will lead to looseness. Maintenance of jade ornaments 1. Cleaning jadeite and emeralds is similar to cleaning diamonds, except that jadeite and emeralds can't be washed by ultrasonic machine or by strong soap or hot water to avoid losing their luster. 2. Maintenance of ruby and sapphire ornaments. Gemstones are cleaned in the same way as diamonds. Other jewelry knowledge 1. Pure gold (that is, pure gold): refers to the gold containing more than 99% of pure gold as stipulated by the State Bureau of Technical Supervision, and the word "pure gold" is engraved. 2. Platinum (common name: platinum) refers to platinum (99% pure platinum, 95% pure platinum, 90% pure platinum) with the words "Pt990 and Pt950" specified by the State Bureau of Technical Supervision.