They all wear gold watches. Why is yours so cheap?
0 1.k gold
K-gold refers to the alloy of gold and other metals, which is widely used in watches at present. Because its English is KaratGold, it is abbreviated as K-gold. The hardness and strength of pure gold can not meet the requirements of use, and it is not suitable for making watches. Other metals must be mixed to enhance the hardness. At present, 18K gold is mainly used in watchcases, which means that 24 alloys contain 18 gold, which is equivalent to 70%.
02. 18K gold
It is usually called "18K gold". The approximate composition is 75% gold 12.5% silver 12.5% copper. Because of the existence of "copper", this substance will be oxidized and discolored for a long time, and "copper" is also an element that can cause skin allergies, which may cause itching and rash of skin cancer.
03. 18K rose gold
Its color is brighter red, which is determined by a large amount of copper, so the risk of allergic oxidation is higher. We should pay more attention to avoid contact with chemicals, such as various detergents, to avoid discoloration and corrosion. It is best not to touch tap water, and the chlorine in it will also kill its color.
04. 18K platinum
Yellow is white. The composition is gold, silver, copper, nickel and zinc, and the hardness is relatively high, about 200HV (HV stands for Vickers hardness). But in order to make the color appear silvery white, the surface is usually plated with money. The hardness of the electroplated surface is as high as 800HV, but the coating is very thin, which usually falls off within two years and needs to be electroplated again.
Common ones are as follows:
18K gold: 75% gold+16% silver +9% copper.
18K platinum: 75% gold +3% silver +9.5% copper+12.5%6 pieces.
18K rose gold: 75% gold+12.5% silver+12.5% copper.
18K rose gold: 75% gold +9%6 silver+16% steel.
18K red gold: 75% gold +5.5% silver+19.5%6 copper.
Tricolor gold: 18K platinum+18K gold+18K rose gold.
05. Platinum
Platinum is a rare and expensive natural pure white precious metal, known as the king of precious metals, and one of the rarest precious metals in the world. Its annual supply is only 5% of gold, its strength is almost twice that of gold, and it is 30 times rarer than gold. Because there is no gold component at all, platinum and k gold are completely different materials: they will not cause skin allergies. It is rarer than gold and has a higher melting point than gold. Therefore, the processing is more difficult and the price is higher. This natural material is whiter than platinum, so it does not need electroplating, and it will hardly change color and will not be corroded when worn daily. Platinum is easily confused with platinum, but at least in the watch industry, one belongs to platinum and the other belongs to k gold, which is irrelevant.
06. palladium gold
Platinum group elements, silvery white. It is even rarer than platinum, and its performance is better than platinum. It is not only resistant to oxidation, corrosion, wear and high temperature, but also has a brighter metallic luster than platinum. It is generally used by the world's top luxury watch brands to make watchcases.
Whether it is K gold or platinum, it is really worth their different premiums in terms of the difficulty of mining and processing. When you get started, you can obviously reveal the different texture from relatively cheap materials such as stainless steel from the visual effect.
No matter what kind of gold is used on the watch, the proportion of material value is actually very small.
If the value is defined by scarcity, platinum is the most expensive thing here. It has the highest hardness and the highest processing difficulty, so it should be the most expensive choice. Therefore, any brand that uses platinum case must be the highest price in the same series. Rose gold is similar to rose gold, and the price is the same as gold and platinum. How to choose? More is skin color and color matching, and has nothing to do with face value.