Roseville (formerly, Roseville Junction, Junction, and Grider's) is the largest city in Placer County, California, United States, located in the Sacramento metropolitan area. As of January 1, 2015 the State Department of Finance estimated the City's population to be 128,382.
These types of crystals are made up of small molecules that hold themselves together using weak electrical forces. There is also quite a bit of space between these small molecules. These types of crystals have low melting points and are good insulators. Diamonds. Diamonds are a good example of a crystal that is made up of large molecules. They are created from a large molecule that is put together in three dimensions. Diamonds are made only of carbon atoms, and each carbon atom is bonded to four other carbon atoms that are at equal distance to each other and are grouped around it.
As the window to your timepiece, the watch crystal takes some of the hardest hits, and the brunt of the everyday wear and tear. To extend the life of your watch crystal, crystals are made of different materials to ensure different kinds of strength. Plastic crystals are the most flexible of all the watch crystals, and therefore are used in a wide range of watches. Glass crystals are also common in watches. The wonderful thing about plastic and glass crystals is the fact that they can be custom cut, shaped, or trimmed to fit different watch cases.