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.

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".

Standard gold jewelry

Refers to gold products produced according to national standards, including pure gold and thousands of pure gold; The designated sales unit of standard gold ornaments refers to jewelry gold shops or department stores that abide by these measures and are evaluated by Fujian Baoxie, with quality up to standard and standardized price composition.

quality requirements

The nominal value of gold content of OTC pure gold jewelry and thousands of pure gold jewelry must be consistent with the actual test results (to ensure that the gold content of the sample is detected in a uniform state after melting); Each piece of jewelry must be engraved with the material name, material content and manufacturer code according to the standard. Every piece of jewelry must have a quality certificate tested by an inspection agency.

Extended data

Maintenance method

1, cleaning chemicals will change the color of gold, so take off the gold ornaments before cleaning.

2. Avoid direct contact with volatile substances such as perfume and hair gel, otherwise it will easily lead to the fading of gold ornaments.

3. Take off the gold ornaments when swimming to avoid chemical changes on the surface after contact with seawater or pool water.

4. Wrap it in flannel and put it in a jewelry box when keeping it to avoid mutual friction and damage.

5. Gold is soft and easy to deform. Do not pull necklaces and other accessories to avoid deformation.

6. Pure gold jewelry will react chemically when it encounters mercury, and white spots will appear. When cleaning, as long as you barbecue under the alcohol lamp for a while, it will return to its original color.

7. After wearing, gold ornaments often lose their luster due to stains and dust. At this time, just put the gold ornaments in a neutral detergent, soak them in warm water, and then take them out and dry them.

Cleaning method

1, in order to protect the luster of gold jewelry, you can coat it with a thin layer of nail polish.

2. If there is a black silver film on the surface, 2 grams of salt, 7 grams of baking soda, 8 grams of bleaching powder and 60 ml of water can be used to prepare a "gold cleaner". Put the gold jewelry in a bowl, pour the detergent, take it out after 2 hours, rinse it with clear water (preferably not hard water), bury it in sawdust to dry, and then wipe it with a soft cloth.

3. Ring with gemstones Roll a piece of cotton with popsicles or matchsticks, soak it in the mixed solution of toilet water and glycerin, scrub the border of the gem, and then polish the ring with flannel. Never scratch with sharp objects such as blades.

4, salt and vinegar mixed into a cleaning agent, use it to wipe pure gold jewelry, can make it durable.

5. Toothpaste wiping or scrubbing with hot rice soup can also restore luster.

6, 70% nitric acid and 98% sulfuric acid can be used in a ratio of one to three, but this is a chemical reaction to clean, which has a certain loss to gold.

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