All jewelry-grade products in Tangguohe are made of 18K and 14K gold.

Gold is a relatively stable metal among many metals. It has the characteristics of corrosion resistance, oxidation resistance, and wear resistance. It is also soft, ductile, and easy to forge, making it very suitable for use in jewelry creation. However, pure gold is too soft and not suitable for inlaying gemstones. It is also easy to deform in appearance, so other metals need to be added to increase the hardness of gold.

Gold purity is divided into 24 equal parts, 24K is pure gold, 18K gold is 18/24 equal to 75%, so it is called K gold 750, and so on. And because of the different types of added metals, K gold has three colors, yellow, white (silver) and rose gold.

Another common jewelry and metal is platinum, which is often called white gold, but it should not be confused with white gold, as they are different metals. Platinum is marked as PT, PT900 means 900/1000 purity, and PT950 means 950/1000. Platinum only has one color, white (silver).