First, the precious metal material (1) Platinum: A rare and expensive natural pure white metal, one of the rarest jewelery precious metals in the world, supplying only 5% of gold each year, with almost twice the strength of gold, Rare gold 30 times. Platinum pure white, natural purity, purity up to 90%, totally natural, often worn will not fade. Pt900 represents a purity of 90% platinum jewelry, Pt950 represents a purity of 95% platinum jewelry. (2) K gold: K gold refers to the alloy of gold and other metals mixed together, because English is Karat Gold, so referred to as K gold. Precious metal part, pure gold is 24K, but pure gold is not suitable for making watches too soft, must be mixed with other metals to enhance hardness, usually silver, copper and palladium-based, but no matter what kind of metal mixed, the proportion of pure gold accounted for 75% . With the ratio of gold, silver and copper, can produce five different color materials, respectively, to indicate the level of copper content of N, such as the highest copper content of red 5N, while the white is correct to say white K gold. (3) Silver: Silver is an ancient precious metal, the most widely used material for pocket watches of the eighteenth century and before, and 925 stands for the purity of silver, the highest purity of silver. Silver is an active metal that readily reacts with the sulfur in the air to create a black oxide that turns black silverware. Today in the application of the table far better than gold, because it is extremely easy because of water, moisture and other reasons and lost luster. Second, other metal materials (1) half a gold: the use of stainless steel and 18K gold with each other, showing a unique two-color beauty. (2) gold: the stainless steel case, a layer of gold alloy outsourcing, mechanical rolling as a whole, the thickness of the micron as a unit of measurement, 1 micron is equal to 1/1000 mm. Up to 10 to 15 microns thick, typically only 2 to 3 microns. (3) Electroplating: Electroplating is a common watch case decoration method in modern watches. The electroplating technology is rising in the seventies. Because electroplating is uniform and firm, it is less costly and less likely to be peeled off than the gold, So quickly both out of the market. (4) Copper: In the watch, copper is the best thing, it is cheap, and the characteristics are extremely easy to process, it is mainly used in the movement, the current use of most of the movement is the brass alloy splint. Usually we see the movement of the color yellow and white, yellow movement is usually plated titanium dioxide, white movement is galvanized nickel alloy. (5) steel: steel, chromium and nickel compounds, stainless steel, chromium and nickel compounds, stainless steel processing difficult, corrosion resistance and wear resistance are better than the former, the surface can be plated or not, only Polished or sand blasting, sand processing, the formation of different effects have a three-dimensional appearance of the effect. (6) Titanium: Due to the craze in the all-steel watch, titanium metal gradually emerge. Its material is called "aviation era" metal. What is titanium? Titanium is found in the Earth's shell, its appearance can be shiny shiny metal, or silver gray, dark gray powder. Titanium is a lightweight, hard, heat-resistant, hard-wearing metal with an oxide film on the surface to prevent wear and rust. (7) Tungsten-Titanium Alloy: The tungsten carbide and titanium carbide powders are first pressed into the blanks at a pressure of 1000 Pa and then die-cast, and then sintered in a special furnace at a temperature of 1450 degrees Celsius to a high-density part , And finally after a number of processes and polished with diamond powder made of glittering tungsten-titanium alloy, good wear resistance. (8) Tungsten steel: high hardness, wear resistance, clear appearance lines, bright and clean, known as "wear-resistant material." Can be used in combination with steel, made of stainless steel ring or strap, grain, increase the shell, with the surface abrasion resistance and decorative. (9) Precision ceramic: precision ceramic smooth, wear-resistant, do not hurt the skin, the main component is zirconia, under certain temperature conditions to obtain good processing performance, and then through advanced processing methods, made into exquisite case, strap , But also through a variety of special methods, even more gorgeous noble. (10) high-tech ceramics: the very fine zirconium oxide or titanium carbide powder, the powder is injected into the mold at high pressure, the sintering furnace at 1450 degrees Celsius to form hard-to-wear ceramic parts; and then polished diamond powder, square Can be made of unique high-tech luster ceramics. (11) high-tech lanthanum: the rare earth elements lanthanum broken into fine particles, the rough embryos into the furnace with high temperature and pressure compression. Its hardness is higher than tungsten-titanium alloy, high-tech ceramics, more difficult to wear, and emit a mysterious light. (12) Blue Steel: Blue Steel is a kind of steel that is formed through a special sintering process, so it will emit a blue halo color. Blue steel is mainly used in hands. In addition to beautiful, more antioxidant properties.