Sapphire
September Birthstone
Whilst typically associated with the color blue, sapphires can also naturally occur in a wide variety of colors such as blue, yellow, purple, orange, green colors - which are also called "fancy sapphires". "Parti sapphires" are those sapphires which show two or more colors in a single stone.
Sapphire is the most precious and valuable blue gemstone. It is a very desirable gemstone due to its excellent color, hardness, durability, and luster.