9/1/2023 0 Comments Yogo sapphire![]() ![]() Gold was discovered at Yogo Creek in 1866, and though "blue pebbles" were noticed alongside gold in the stream alluvium by 1878, it was not until 1894 that the "blue pebbles" were recognized as sapphires. Yogo sapphires were not initially recognized or valued. ![]() Today, several Yogo sapphires are part of the Smithsonian Institution's gem collection. Jewelry containing Yogo sapphires was given to First Ladies Florence Harding and Bess Truman in addition, many gems were sold in Europe, though promoters' claims that Yogo sapphires are in the crown jewels of England or the engagement ring of Princess Diana are dubious. It is estimated that at least 28 million carats (5.6 t or 5.5 long tons or 6.2 short tons) of Yogo sapphires are still in the ground. Because Yogo sapphires occur within a vertically dipping resistive igneous dike, mining efforts have been sporadic and rarely profitable. They have high uniform clarity and maintain their brilliance under artificial light. Yogo sapphires are typically cornflower blue, a result of trace amounts of iron and titanium. ![]() Yogo sapphires are blue sapphires, a colored variety of corundum, found in Montana, primarily in Yogo Gulch (part of the Little Belt Mountains) in Judith Basin County, Montana. Hexagonal, rhombohedral, prismatic or dipyramidal A 0.65-carat (0.130 g) cornflower blue Yogo sapphire ![]()
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