Yogo Sapphires
Pictured above is the Tiffany Iris, constructed primarily of Yogo Sapphires which are mined only in the Yogo Gulch, MT (USA) and boast the purest untreated sapphires in the world. I'd encourage readers of this blog to follow the Wiki link embedded and learn about these awesome stones. It is an interesting lesson for investors to consider: the value of these "worthless tailings" ultimately became worth far, far more than the actual gold that was being sought at the mine.