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What gold is 750?
750 represents the purity of gold, which means that the purity of gold is 750 thousandths, and the other 250 thousandths are other metals, that is, 18K gold. K is the unit of purity, pure gold is 24K, and 18K gold is 750 gold. K gold refers to the alloy in which gold and other metals are melted together. Its English word is Karatgold, so it is called k gold for short. K gold is rich in color, including platinum, gold, rose gold and black gold. "K gold" is the natural color of K gold itself, which is yellow; "k platinum" is a white alloy of gold and palladium or nickel, which is white; If copper is added, it will appear rose gold. The gold content of 1K is 4. 1667%, and 18K is 18×4. 1667%=75%, that is, the gold content of "18K gold" jewelry is 75%. "18K platinum" is 75% gold and 25% palladium or nickel. Extended data:

Maintenance method 1. When wearing a diamond ring inlaid with 18K gold, try to avoid contact with chemicals. The primary color of 18K gold is golden yellow, while the white 18K gold we see is the color after electroplating. If articles containing chemical components (such as skin care products, hand sanitizer, vinegar, etc. ) frequent contact, the electroplating layer is easy to be corroded, exposing the primary color of 18K gold. Therefore, please take off the diamond ring when removing makeup, and don't wear it for cooking, washing clothes or doing chemical experiments. Before doing these things, put the diamond ring gently in the jewelry box specially prepared for the diamond ring. 2. Avoid collision or friction between the diamond ring and hard objects such as metal. Although diamonds are hard, they may also have cracks. 18K precious metals such as gold and platinum will also be scratched due to friction, or extruded and deformed, resulting in an unsightly diamond ring. Therefore, when wearing a diamond ring, it is not advisable to do strenuous physical strength or exercise. This can not only wear elegant taste, but also protect the diamond ring from being damaged. 3. Avoid placing the diamond ring in an environment that is too cold or too hot. Metals expand when heated and contract when cooled. So the diamond ring will be affected by temperature. Putting the diamond ring in an over-cooled or over-heated environment will affect the firmness of the diamond inlay, and may even make the diamond loose and fall off, causing unnecessary losses. Therefore, don't put the diamond ring in a place that is too cold and overheated, and try to avoid going in and out of places with large temperature difference between hot and cold, such as cold storage and bathroom. 4. Wipe gently with a soft cloth often, but don't wash too many things with hand sanitizer containing chemical components, which will inevitably touch many items. Therefore, diamond rings are more susceptible to dust or oil pollution. You can gently wipe it with a soft cloth at any time, but don't use hand sanitizer containing chemical components to avoid corrosion of precious metals. You can also go to the store where you buy diamond rings regularly and ask the staff to help you clean them and remove impurities such as dust and oil, which can not only avoid the damage of these impurities to the diamond ring, but also make the diamond ring look brand-new. In other words, the maintenance of 18K gold wedding diamond ring is also a matter of attention when wearing it. As long as you can pay attention to these matters at ordinary times, it is the best maintenance for 18K gold diamond ring.