Sapphire Glass never wear do?
This argument is not scientific, any substance can not ever wear, should be "easy to wear." Sapphire is currently 9 degrees hardness only to diamonds, MO-type hardness of 10 degrees, while the hardness of ordinary glass, MO-type 5-6 degrees.
Since the upsurge under the leadership of steel replica cartier watches, titanium metal gradually emerge. The materials known 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 metal texture hard, harder than steel 30% lighter than steel titanium, strong corrosion resistance. When it exposed in the air, the titanium metal surface will form a layer of close and tough film, and thus resistant to a number of substances will eat into the metal, for salt water corrosion is the strongest. Titanium omega watches them very comfortable to wear because nickel is characterized by distinct but not to stimulate the skin, even if the wear has no effect on sweating. In addition, because of its texture, light and hard, so titanium is more durable form.