1, three nines of gold jewelry refers to gold jewelry with a purity of over 99.90%.

2. The four nines of gold ornaments refer to gold ornaments with a purity of over 99.99%.

It can be seen that the purity of four nines is higher than that of three nines!

Gold ornaments are ornaments made of gold. Gold is a precious metal and one of the earliest metals discovered, developed and utilized by human beings. The purity of different gold ornaments is different, and the domestic gold ornaments are generally three nines, because it is difficult to achieve the overall purity of 99.99% in the production or processing process, and the manufacturing process is too complicated and the cost is too high, so the three nines are mostly used.

Extended data:

Daily maintenance of gold ornaments;

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.

References:

Baidu encyclopedia-gold ornaments