Yogo Sapphires are the most precious sapphires found in North America. They are considered to be among the finest sapphires in the world. These unique gems come from only a limited area, named Yogo Gulch, located in the Little Belt Mountains of Montana.
Internally, Yogo Sapphires are usually free of inclusions and their color is consistent throughout the whole stone; unlike heat treated sapphires, where the color is banded within the stone. Heat-treating is very common in sapphires throughout the world to improve both the color and clarity of the stones, but the perfect crystallization of Yogo Sapphires during their geologic formation allowed them to have even coloring and very pristine clarity. With Yogo Sapphires, their color is one of the truest blues of sapphires available without treating, and is frequently referred to as “cornflower blue.”