It should be noted that all kinds of gold watch are not made of pure gold, are generally made of gold, silver, copper, zinc alloy, or the use of mechanical, electrolytic and other methods, the gold alloy cover the outer shell. Because pure gold soft, low hardness, not wear-resistant, unsuitable for the case. Gold alloy hardness is much larger than pure gold, so use it to make the case or plating case is very solid, and reduce costs.
1. K gold shell table. "K" is the first letter of the German "Karat" and is used to indicate the purity of gold. The larger the K number, the higher the gold content. Pure gold is 24K, common K gold watch has 9K, 10K, 12K, 14K and 18K and other 5 kinds. The golden signs of imported K gold shell watch are generally brushed inside the back cover of the watch; there are also women heads (indicating 18K), birds (indicating 14K) and trees (indicating 10K) as signs.
2. Gold-plated watch. It is the surface of the copper shell, the chemical method of plating a layer of gold alloy, the thickness of the micron (symbol μ) as a unit of measure 1 micron equal to 1/1000 mm. International Organization for Standardization of gold-plated form of the standard is: the English letter "C" said K; "P" that thickness. Such as "C18P20" is the purity of 18K, the thickness of 20μ gold-plated watch.
3. Gold watch. The case for the copper, outsourcing a layer of gold alloy, the mechanical rolling into a whole. In addition, there is a steel backpack gold watch, the back cover of this type of watch is stainless steel, only the shell to be gold. Gold standard package only standard thickness, not marked purity. International Organization for Standardization of the standard marking of the package is the English letter "L" that the thickness. Such as "L40" is the gold foil thickness 40μ, the general thickness of 20μ, 40μ, 60μ, 80μ and other 4 kinds.
4. Golden circle watch. Generally all steel watches, only in the upper shell along the outer side of the table set with a circle of K gold, it can be separated from the case. K gold purity 7K, 9K, 10K, 14K, etc., generally less than 0.5 mm in thickness.
5. Gold ring ear shell table. It is made of K gold piece, permanently cover the top of the watch attached to the 4 feet, the other with the same gold ring watch. International Organization for Standardization standardization of the paste is: the letter "C" said the thickness, generally not marked purity. Such as "C250" is the thickness of the paste 250 microns. At present, there are three kinds of thickness of 200μm, 250μm and 300μm.
There is also often a yellowed watch on the market today, a generic name for the golden case, which is generally gold-free, with titanium.
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