1. Precious Metals

(1) Platinum
Platinum is a kind of rare and expensive natural pure white metal. It is one of the most rare and precious metals for production of jewelry in the world. The supply of Platinum is only 5% of gold annually. It is more harder and rarer than gold. With white gloss, naturally purity (as high as 90%), Platinum jewelry will not fade even though you wear them frequently. As we usually say, Pt900 stands for 90% purity platinum jewelry and Pt950stands for 95% purity platinum jewelry.
  
(2) K Gold
K gold is a kind of alloy which mixes gold and other metal. K gold is short for Karat Gold. The precious pure gold is 24K which is too soft to produce watches. Therefore, we need to mix with other metals to enhance the hardness, generally speaking, these metals are silver, copper and palladium. No matter what we mix, the proportion of pure gold is always 75%. With the different proportion of gold, silver and copper, it can produce five different colored materials.  

(3) Silver
Silver is an old and precious metal. In eighteenth century even earlier people usually use this metal to make wristwatch. The number 925 stands for the purity of silver. It is the highest purity of silver. As pretty active metal, silver will easily react with sulfur in the air and generate black oxide layer. This will blacken silver. So in modern times, watch manufacturers rarely use silver to produce watch. It is easily lose its luster due to water and moisture.  

2. Other Metal Materials

(1) Semi-payment mixes stainless steel and 18K gold, presenting a unique two-color aesthetic.

(2)Plating is a common way in modern times to decorate watch. Electroplating technology rose in the seventies. It is uniform and solid, so plating received quickly by watch makers.

(3)Copper is the best material. It is cheap and easy to process. It is mainly used in the movement. Today, most of the movement is brass alloy splint. The movement colors we usually see are yellow and white: yellow movement is usually plated titanium dioxide and white movement is zinc-nickel alloy.
  
(4) Steel

Although we have difficulties to process stainless steel, its corrosion resistance and wear resistance deeply attract the manufacturers. The surface can be plated or not plated just do polishing or sandblasting and lassa processing. It will form three-dimensional effect.
    
(5) Titanium Metals
With the upsurge of steel watches, titanium metal gradually emerges. The materials are named as “air age” metal. What is Titanium? Titanium metal is found in the earth’s crust. Its appearance can be a bright shiny metal or silver-gray, dark gray powder. Titanium is a light hard, heat-resistant and cold-resistant metal. The oxide layer in surface can prevent wear and corrosion.
  
(6) Tungsten steel
High hardness, wear resistance, clear appearance lines clear, bright and clean, Tungsten steel is known as the “wear-resistant materials.” It can be mixed with steel to make bezel or strap. It keep watch more corrosion-resistant and more beautiful.

(7) Precision Ceramic
Fine Ceramics are clean and wearable. It will not hurt skin. Its main component is oxide zirconium. Through advanced processing methods, we can use fine ceramic to make beautiful case and strap.  

(8) Blue Steel
Blue Steel is a kind of steel processed specially. It will emit blue halo color. Blue Steel is mainly used in the pointer. It has anti-oxidant properties and make watch more beautiful.