Sapphire is the most precious and valuable blue gemstone. It is a very desirable gemstone due to its excellent color, hardness, durability, and luster. In the gem trade, Sapphire without any color prefix refers to the blue variety of the mineral Corundum. However, the term Sapphire describes all other gem varieties and colors of Corundum as well, excluding Ruby.
About an sapphire and opal mining areas in Australia.
Madagascar's illegal sapphire mines.
They introduce about an Madagascar’s Ilakaka sapphire mining area.
Process of Sapphire Mining in Philipsburg, Montana.
Sapphire Fossicking at Glenalva (2017).
The newly established Rock Creek sapphire mine in Montana.